Panic in the air: Fighters scrambled to escort jumbo after passengers became suspicious of couple's lengthy 'making out' in the toilet

• Flight escorted by fighters after two passengers locked in the toilet
• Passengers on AA flight locked in the toilet prompt NORAD response
• Federal agents are questioning a man after device found in his carry-on bag
• Three vans stolen in September prompt fears of worker disguised terrorists
• Flight to Baltimore diverted after 'suspicious behaviour' by passenger
• 'Abandoned' truck loaded with pyrotechnics for TV show shuts Dallas airport
• Internet shut down in buildings near Ground Zero as safety precaution

Two fighter jets escorted a jet airliner flight from Denver after two passengers locked themselves in an on board toilet - the second such incident today.
After Police detained and questioned three passengers at Detroit's Metropolitan Airport on Sunday after the crew of the Frontier Airlines flight reported suspicious activity on board, and two F-16 jets shadowed the flight until it landed safely, airline and federal officials said.
According to ABC news, law enforcement officials said the pair were 'making out'.

Panic: The nature of the incident was unclear, but the passengers locked themselves in the bathroom and were still inside when the plane landed

The Airbus 318 taxied to a pad away from the terminal, and police took three passengers into custody, Kowalchuck said.
Frontier Flight 623, with 116 passengers on board, landed without incident in Detroit at 3:30 pm EDT after the crew reported that two people were spending 'an extraordinarily long time' in a bathroom, Frontier spokesman Peter Kowalchuck said.
The news comes after The North American Aerospace Defense Command scrambled two F-16 jets to shadow the Boeing 767-200 Flight 34 until it landed safely at New York's Kennedy Airport at 4:10 pm today.
A law enforcement official said it wasn't thought to be terrorism, and American Airlines spokesman Tim Smith said, 'In our eyes, it's a big nothing.'

The nature of the incident was unclear, but the passengers locked themselves in the bathroom and were still inside when the plane landed, the law enforcement official said.
The jets intercepted the flight about 100 miles west of New York and shadowed it until it landed, said John Cornelio, spokesman for the North American Aerospace Defense Command.
He described the measure as precautionary.
New York has been in a heightened state of security after federal officials received a credible but uncorroborated tip of a car bomb plot on the anniversary in either New York or Washington.
The news follows the earlier shut down of part of Kansas City International Airport as police investigated the discovery of a suspicious item found during the screening of carry-on baggage.
Federal agents in Missouri are questioning a man after the device was found by the x-ray machine at a Southwest Airlines gate, prompting an evacuation of the area.
The development comes as thousands of NYPD officers continue to line the city's streets on high alert over the risk of a terrorist attack on the the 10th anniversary of 9/11.

Red alert: A sniper today scans the area surrounding at the National September 11 Memorial as the ceremony marking the 10th anniversary of the attacks at the World Trade Center site begins

Southwest spokesman Chris Mainz said transportation security agents stopped a man going through the checkpoint and asked to examine something in his bag.
He said the man refused to cooperate and was taken into custody, and a bomb squad was called to the scene to examine the device, which was found during x-ray screening at 9.30am local time.
The man was passing through Gate 39 in Terminal B and airport spokesman Joe McBride said he did not know which flight the passenger planned to board, as the security checkpoint serves multiple gates. The airport has three separate terminals.
Gates 37 through to 39 waiting areas were cleared after the incident and the access road to the terminal was shut down as a precaution, Mr McBride said.
Southwest and Delta continued to fly out of the terminal this morning, he said.

Police presence: NYPD officers today surround the North pool of the 9/11 Memorial during tenth anniversary ceremonies at the site of the World Trade Center

Protected: President Obama stood behind bullet-proof glass as he addressed those at the World Trade site

FBI investigators are still working to establish the identities of three assailants referred to in a specific car-bomb terror threat.
Meanwhile police in Massachusetts were today scrambling to track down a Penske truck after receiving a report that three men were seen loading large drums into the back of the vehicle late last night.
In other security threat, a flight headed to Baltimore had to be diverted to Nashville after a passenger exhibited 'suspicious behaviour' and a suspicious object was discovered at Dulles International Airport near Washington yesterday.
In other scares, an unattended truck packed with pyrotechnics for the cable TV show 'Sons of Guns' caused police at Dallas/Fort Worth Airport to temporarily shut terminal B.
Speaking to MSNBC, an executive of the production company said the incident was, 'a simple yet colossal error in judgement by a member of our staff.'
In New York, snipers stood on the roofs of buildings overlooking the World Trade Center site as the 9/11 Memorial got underway this morning, with President Barack Obama in attendance.
Roads were blocked and police checkpoints for both vehicles and pedestrians surrounded the memorial, with backpacks checked by bomb-sniffing dogs and put through x-ray machines.
The secret service shut down the internet in buildings near Ground Zero as a security precaution.

On the lookout: Security officers today scan the area surrounding at the National September 11 Memorial as President Barack Obama addresses the nation at the ceremony

Assassination threat? U.S. President Barack Obama stood behind a bullet-proof wall as he addressed the crowd, with First Lady Michelle Obama, former President Bush and his wife Laura Bush also protected

Eyes open: Secret Service snipers patrol the roof of the 9/11 Memorial Museum today

Officers in Massachusetts were have been told to be on the lookout after someone in Boston saw men loading a number of 55-gallon drums into a Penske truck, state police spokesman David Procopio said.
The truck was spotted Saturday night on the 600 block of Columbus Avenue in Boston's South End, he said. Boston police had stopped and checked a number of trucks matching the description but nothing suspicious had been found, a department spokesman said.
Earlier today, police were investigating reports that a mentally-disturbed military veteran could be on his way to Ground Zero.

The parents of the North Carolina Army vet informed officers of their concerns and security services are taking the matter seriously, CNN reported.

On alert: New York Police Department officers inspect a truck at a vehicle checkpoint in Times Square

Also this morning, an airline official revealed a Southwest Airlines flight bound for Baltimore was diverted to Nashville after what he described as 'suspicious behaviour' by a passenger.
The flight originated in Albuquerque on Saturday morning and landed in Nashville at about 1.10pm CDT. The airline official said that the passenger's behaviour on the plane wasn't disruptive, but he declined to elaborate.

Police ordered all the passengers off the plane, sent them back through security and examined the plane before passengers were allowed back on. It took off again about 3.55pm CDT but it could not be confirmed whether the passenger was on board.

The suspicious object was found at Dulles in a freight container at about 4.30pm yesterday and four hours later was still being checked by Virginia state police near one of the airport concourses.

Wanted: Jude Kenan Mohammad is on the FBI list

Dulles is about 22 miles west of Washington, where authorities are also on alert on the day of the 10th anniversary of the 9/11 attacks.
At the World Trade site, police are on guard that terrorists could be trying to masquerade as construction workers in order to carry out a plot during today's service.
Mr Obama stood behind what appeared to be bullet-proof glass as the Brooklyn Youth Chorus officially opened the ceremony with a rendition of the U.S. National Anthem.
The President was joined behind the shielding by the First Lady as well as president George W. Bush and his wife,Laura.
The ceremony began as police remain hunting for three stolen vans belonging to construction companies doing work in or around the World Trade Center site.
The news comes as the identity of one of the three alleged terrorists plotting a possible attack was revealed.
An image of American-born 22-year-old Jude Kenan Mohammad is on the FBI's Ten Most Wanted list for previous links to terrorism.
He has now been linked to what officials have called a credible but unconfirmed al-Qaeda threat to set off a car bomb on bridges or tunnels in New York City or Washington D.C.
The Wall Street Journal reported Mohammad is among three al-Qaeda leaders that investigators believe pose a particular threat because they have lived in the U.S.
Should that mission prove impossible, the attackers have been told to simply cause as much destruction as they can.
The first vehicle, a dark green Chevrolet van with a yellow turret light, was stolen from the Long Island Expressway on September 1.
On September 2, three men broke into a construction yard before loading $70,000 worth of tools into another stolen van and off with a third vehicle.

Tightened security: Los Angeles airport police today carrying automatic weapons patrol a curbside drop-off area as travellers prepare to board flights at Los Angeles International Airport, the destination of three of four hijacked 9/11 aircraft

The FBI and Homeland Security Department issued a joint intelligence bulletin last night to law enforcement around the country urging them to maintain increased security and be on the lookout for suspicious activity.
'There is specific, credible but unconfirmed threat information,' the head of the FBI's New York division, Janice Fedarcyk, said.
'As we always do before important dates like the anniversary of 9/11, we will undoubtedly get more reporting in the coming days.'
Mr Bloomberg told reporters the city's observance of the attacks will go on as planned.
In Washington, law enforcement officials said they were working 12-hour days indefinitely, and Police Chief Cathy Lanier said unattended cars parked in unusual locations risked being towed.

U.S. INTELLIGENCE WARNS OF 'LOTS OF CHATTER' ON JIHADI WEBSITES

Intelligence officials have warned of 'lots of chatter' on jihadi websites about the imminent anniversary of 9/11, Homeland Security Secretary Janet Napolitano, pictured, said yesterday.
The department will be at a heightened level of readiness as the U.S. commemorates the anniversary but, she said, nothing yet warrants raising the terrorist threat status.
CNN reported Ms Napolitano as saying: 'We don't have something that would reach that standard, but we still have lots of chatter out there. And we take every bit of that seriously and are tracking it down.'
She said the anniversary would likely be an 'iconic' day for al Qaeda. But despite the heightened level of threat she declined to give out details of security preparations.
'I don't want to give those (details) out because I don't want to tell the bad guys exactly what we're doing,' she said.
'But I think it's fair to say that in addition to asking citizens to be vigilant and so forth, that we have ourselves leaned forward and have made sure that we are doing all that we can from the DHS perspective.'

Briefed on the threat information yesterday morning, President Obama directed U.S. counter-terrorism agencies to redouble their efforts, a White House official said.
A White House official yesterday told ABC: 'The President was briefed on this specific threat information this morning and has been updated on it throughout the day.
'The United States government has already significantly enhanced its security posture in advance of the 9/11 anniversary to protect the country against possible terrorist threats.
'Nevertheless, the President directed the counter-terrorism community to redouble its efforts in response to this credible but unconfirmed information.'
As of late last night, there were no plans to change Mr Obama's travel schedule on Sunday in light of the threat, the White House said.
The president is scheduled to mark the September 11 anniversary with stops at New York's Ground Zero, the Pentagon and Shanksville, Pennsylvania.
He also will deliver a speech on Sunday night at a memorial concert at the Kennedy Centre in Washington.
The Department of Homeland Security, which said only last week that there was no credible information that al Qaeda was plotting an attack around the September 11 anniversary, declined to offer details on the threat.
It cautioned that there were always threat reports before important dates like the anniversary of the September 11 attacks.