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All flights bound for Newark Liberty International Airport were halted on Tuesday evening after two pilots reported seeing a drone flying nearby, the Federal Aviation Administration said.

The drone was spotted about 3,500 feet over Teterboro Airport In New Jersey, a small airport about 17 miles north of Newark Liberty that handles private planes, the agency said. After the sightings, takeoffs from Newark were halted and inbound planes were held in the air.

By 5:45 p.m., planes had resumed landing at Newark, but planes headed for the airport from other cities were blocked from taking off, the agency said. Newark is one of the three main airports serving New York City and the surrounding region.

Brett Sosnik, a passenger on a flight headed for Newark, said his plane was forced to circle out over southern New Jersey and eastern Pennsylvania during the halt in arrivals. He said the pilot said they were circling “due to drone activity.”