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Authorities are investigating a phone threat involving the Lincoln Tunnel.

(Journal file photo)

Officials said a phone threat triggered police activity in Weehawken at the Lincoln Tunnel at about 5:45 p.m. today.

According to emergency responder radio transmissions, a 911 call received about a possible threat of unknown type has also triggered rooftop searches by helicopters from the Port Authority Police Department and the New York City Police Department.

A law enforcement official said he could not release any information at this time due to the ongoing nature of the investigation.