A bomb threat was made to an Alitalia flight from Milan, Italy, to Kennedy Airport Sunday, officials with the airline said in an email.

Alitalia officials said the Transportation Security Administration informed them of the bomb threat directed at Flight AZ604, which took off from Milan's Malpensa Airport at 1:30 p.m. local time and landed at Kennedy Airport at 4:08 p.m.

The Port Authority referred all comments to federal officials.

Anthony L. Bucci, a spokesman for U.S. Customs & Border Protection, said in an email Sunday night that "TSA was contacted and responded, and it was determined to be negative."

All passengers exited the plane at Kennedy Airport "without any problem," Alitalia said.

A Port Authority PBA Twitter account posted photos of officers helping passengers back onto the flight.

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Maxim Sorin, 33, of Manhattan, a passenger on the flight, said in a phone interview Sunday night that after the plane had landed, passengers got off and were directed onto buses.

They had to wait for about an hour and a half on the tarmac before they returned to the plane to get their belongings.

Sorin described the experience as "frustrating."