Party atmosphere: As many as a million people are expected to attend the raucous celebration at the 'Crossroads of The World' Thursday night

In the aftermath of the ISIS-inspired mass shooting in San Bernardino, California, earlier this month and the attacks in Paris in November, the FBI and local police departments are not taking any chances.

On Tuesday, New York City Mayor Bill De Blasio described security measures that were put in place to protect up to a million revelers who will ring in 2016 at Times Square as 'more extensive than ever.'

‘I certainly understand that everyone's concerned and I want everyone to understand and to hear that the NYPD is ready,’ De Blasio said in a local radio interview.

A total of about 6,000 officers will be on hand, including more than 500 members of the newly formed Critical Response Command who are specially trained in preventing acts of terror, the city's police chief Bill Bratton told reporters, noting that some would be in plain clothes.

After the Paris attacks on November 13 that killed 130 people, an ISIS propaganda video showed images of Times Square and a shot of a suicide bomber.

'This is the best prepared city in this country to stop terrorism, and people should rest assured that they will be very well protected on New Year's Eve,' De Blasio said.