WASHINGTON/NEW YORK (REUTERS)- President Barack Obama sought to reassure Americans they are safe as millions of people travelled on Wednesday (Nov 25) for the Thanksgiving holiday, with security heightened at airports, New York City's parade festivities and other venues after the Paris attacks.
"Right now, we know of no specific and credible intelligence indicating a plot on the homeland," Mr Obama told reporters at the White House, flanked by his FBI director and other top security officials. "We are taking every possible step to keep our homeland safe," he said.
The US State Department issued a worldwide travel alert on Monday (Nov 23), warning American travellers to remain vigilant, particularly when visiting foreign countries.
Nearly 46.9 million Americans will travel over the Thanksgiving long weekend - the busiest US travel holiday of the year - with 3.6 million going by plane, according to the AAA, a motorist advocacy group.
Most US airports reported flights delays of less than 15 minutes, according to tracking websites. Travellers at airports from Washington to New York said they saw heavier than normal security but that travel was smooth.
Americans have become more concerned about threats since a series of attacks in Paris two weeks ago killed 130 people and now identify terrorism as the most important problem facing the nation, Reuters-Ipsos polling shows.
"We have to live our lives right? We're having a good time. We did a cruise and now we're doing New York City," Ms Karen Damaschino, 47, of San Francisco said after landing at John F. Kennedy International Airport to spend the holiday in New York.
The US response to Islamic State in Iraq and Syria (ISIS) has become a top issue in the race to succeed Mr Obama in the November 2016 presidential election. In his statement, Mr Obama tried to allay Americans'concerns.
"I know that families have discussed their fears about the threat of terrorism around the dinner table, many for the first time since September 11," he said, referring to the 2001 attacks by Al-Qaeda on New York and Washington.
But he told Americans they should "go about their usual Thanksgiving weekend activities" while remaining vigilant to any suspicious activities.
To underscore Mr Obama's message, his Homeland Security Secretary Jeh Johnson held a photo op at Washington's Union Station just before boarding an Amtrak train to Newark, New Jersey, on the heavily travelled North-east corridor, en route home for the Thanksgiving Day holiday.
"It should be obvious to the public that there is a heightened presence" of law enforcement officers at train stations, airports and other public places, he said. "We are working overtime to protect the homeland."
Some travel analysts expected airport delays as a result of the heightened security. Officials at the Transportation Security Administration, which oversees airport security, declined comment.
The FBI sent a bulletin earlier this week to police departments across the country warning of possible copycat incidents and sharing intelligence on how the assailants in Paris carried out attacks on Nov 13 that killed 130 people.
'BUSINESS AS USUAL'
In New York City, officials stressed there was no specific threat, despite a video released last week by the militant group ISIS that included images of New York. ISIS has claimed responsibility for the Paris attacks.
As many as 3.5 million people were expected to line the 4km route of the Macy's Thanksgiving Day Parade in New York City on Thursday, according to parade organisers.
Many were expected to head to Manhattan's Upper West Side on Wednesday (Nov 25) to watch the giant parade balloons being inflated on the eve of Thursday's (Nov 26) parade.
The New York Police Department is ramping up its usual tight parade security, adding members of a new counterterrorism unit, officials said.
City officials have made numerous public appearances in recent days seeking to reassure New Yorkers and tourists.
"There remain no credible and specific threats against New York City," Mayor Bill de Blasio told reporters on Monday. "I'm very, very confident in the NYPD's preparation for the parade."
The 89th edition of the parade, which features 8,000 performers, kicks off holiday events in the city, including the lighting of the enormous Christmas tree at Rockefeller Center next week and the New Year's Eve celebration in Times Square.
More than five million visitors come to the city between Thanksgiving and New Year's Eve, according to the city's tourism agency. Agency spokesman Chris Heywood said all events are "business as usual".