Washington, Jan 4 - Newark International Airport in New Jersey was under lockdown after a man reportedly passed through the exit of a security checkpoint without being screened, US media reports said.

The Federal Aviation Administration said on its website that the airport's terminal C had experienced a security breach.

All passengers who had already passed through the security check point were being re-screened and no flights were leaving from the terminal, CNN reported.

Airport security reviewed surveillance tapes, but the man had not been located, Fox News reported. It was unclear whether he posed a legitimate security threat. (dpa)