The Federal Aviation Administration said a series of issues prompted it to dramatically slow traffic at Newark Liberty Airport on Monday, prompting United Airlines to divert at least 35 flights to other airports.

The FAA issued a ground stop for Newark-bound flights around 1:53 p.m. due to an equipment failure. Departures headed to Newark were held at their origin airports through at least 5 p.m., officials said.

Flights into and out of Newark Airport are experiencing heavy delays Monday afternoon, according to the FAA. An FAA airspace operations center in Philadelphia, which oversees the airspace for Newark Liberty International Airport,