WARWICK, R.I. (AP) — Authorities have ended a search for a possible small plane down in upper Narragansett Bay after finding no sign that a crash had occurred.

The Warwick Fire Department says no evidence of a downed plane has been found. An air traffic control tower at T.F. Green Airport saw a radar blip that appeared to be a plane drop off the radar four miles southeast of the airport. The incident occurred around 7:30 a.m. Thursday.

There was no visual, radio or transponder contact with the possible aircraft, and fishermen and quahoggers (KOH'-hog-erz) in the area and didn’t call in anything.

Fire officials say birds may have created the blip.