In New York City, record-breaking crowds is expected for the annual Macy's Thanksgiving Day parade, and Police Commissioner William Bratton said the city was deploying more officers at the annual event than ever before.

Nearly 46.9 million Americans will travel over the long Thanksgiving weekend - the busiest U.S. travel holiday of the year - with 3.6 million going by plane, according to the AAA, a motorist advocacy group.

Most U.S. airports reported flights delays of less than 15 minutes, according to tracking websites. Passengers at airports from Washington to New York said they saw heavier than normal security, but that travel was flowing smoothly.

The U.S. response to Islamic State has become a top issue in the race to succeed Obama in the November 2016 presidential election. In his statement, Obama tried to allay Americans' concerns.

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