TETERBORO, N.J. (AP)  -- Federal aviation authorities are investigating an incident in which an air traffic controller let a Learjet land on a closed runway at New Jersey's Teterboro airport.

FAA regional spokesman Jim Peters tells the Star-Ledger of Newark that a flight operated by Jet Rider Inc. was allowed to land on June 25 as two workers were preparing to mark the runway with a large ``X'' sign indicating it was closed.

Peters said the flight was cleared to land shortly after 5:30 a.m., more than a half-hour after Runway 1-19 had been shut down for work.

The jet passed 150 feet above the workers, neither of whom was injured.