Security at JFK airport
Security at JFK airportReuters

Two flights were delayed and their passengers temporarily evacuated at New York's JFK airport Tuesday, after a bomb threat was received.

An anonymous caller reported a pipe bomb was aboard Flight 468 to an operator at Delta Airlines headquarters, law enforcement officials told NBC.

Passengers were deboarded from two flights, because both shared the number 468 – one of them was headed to Tel Aviv and the second had landed from San Francisco. Passengers boarded buses on the platform as emergency vehicles waited nearby.

Security teams boarded the planes and carried out a thorough check. When it turned out that the threat was apparently a false one, passengers reboarded and the flights took off. All in all, the delay caused was about 30 minutes.