Passengers of a Spirit Airlines flight were forced to deplane Thursday afternoon amid a police investigation. Allegheny County Police were called to investigate a suspicious security issue involving a Spirit Airlines jet at Pittsburgh International Airport.

Authorities are investigating after a reported possible bomb threat was made onboard a plane at Pittsburgh International Airport Thursday morning, sources tell Channel 11.

Allegheny County Police were investigating “a security issue” at Pittsburgh International Airport after they removed all passengers from a Spirit plane set to fly Thursday morning to Tampa, officials said.

PITTSBURGH (KDKA) - Allegheny County Police are investigating a threat at Pittsburgh International Airport. Law enforcement tells KDKA that a threat was made on board a Spirit Airlines flight heading to Florida just before take-off. The pilots were able to pull over on the runway where it currently remains.

Allegheny County police are looking for the owner of two watches that were found at Pittsburgh International Airport.

A Spirit Airlines flight was disrupted this morning at Pittsburgh International. Allegheny County Police are investigating a possible bomb threat onboard the flight bound for Tampa just before takeoff.

A flight from the Pittsburgh International Airport to Tampa was rescheduled on Thursday while police investigated a bomb threat that they determined was never made. Allegheny County police said they were called to investigate a "security issue" on a Spirit Airlines flight scheduled to depart from Pittsburgh to Tampa.

Allegheny County Police are investigating a threat aboard a flight to Tampa out of International Airport. Hours of secretly recorded videos and phone calls have offered a rare glimpse into how the longest-serving legislative leader in American history operated behind closed doors.