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Newark Liberty International Airport suspended arrivals Tuesday evening due to drones in the area.

The Federal Aviation Administration told NBC News that two drones were detected at 3,500 feet near Teterboro Airport in northern New Jersey. Arrival flights were temporarily suspended from landing at Newark because of the devices but the FAA is now allowing flights to land at the airport.

As a result of the backlog, planes that are still on the ground destined for Newark will be held at their origin airports, the FAA said.

Newark released a statement on Twitter later on Tuesday that said normal operations had resumed.

Normal #EWR operations have resumed after arrivals were briefly held by the FAA due to reports of drone activity north of the airport earlier this evening. We’re coordinating with the FAA & fully supporting all federal law enforcement authorities as they investigate this incident — Newark Liberty Airport (@EWRairport) January 23, 2019

The FAA, which would ordinarily be in a position to address NBC News’ questions, is one of the agencies affected by the partial government shutdown and therefore is short on personnel. The spokesman for the FAA's Eastern Service Area did not respond to requests for comment.