The FAA is investigating after air traffic controllers saw a drone near a jet that was landing at Newark Liberty International Airport.

United Airlines Flight 135 was descending near the airport Sunday when air traffic control alerted the crew about a drone "in the vicinity of the runway," United said in a statement. The crew of the jet, arriving from Zurich, Switzerland, monitored the drone and landed safely, United said.

The FAA said the incident occurred two miles southwest of the airport at 11:55 a.m. Sunday. The FAA is investigating and that local authorities had been notified, the agency said in a statement.

A month ago, a 54-year-old Arizona man was arrested on charges of endangerment and unlawful operation of an unmanned aircraft after a drone grounded aerial efforts to combat a massive wildfire about 100 miles north of Phoenix.

Last week the FAA tweeted: "Flying your # drone this weekend but not sure how high to fly? FAA's resources can help: http://faa.gov/uas # DosAndDonts # DroneQuestion" The primary piece of advice was not to fly a drone above 400 feet.

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