Teaneck High School was briefly locked down Thursday afternoon based on a report of a gun in the building, police said.
The lockdown was lifted after police conducted a search and did not find a weapon, said Detective Capt. Glenn O'Reilly. The incident remained under investigation Thursday afternoon and there were no arrests.
School officials first learned of the threat, but it was not clear how.
Police said they responded to the school around 2:25 p.m. The lockdown was lifted around 3 p.m.
Article last updated with new information from police.