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A SkyWest-Delta commuter jet made an emergency landing Thursday morning at Salt Lake City International Airport after someone told the airline there was an incendiary device aboard.

Airport spokeswoman Barbara Gann said Flight 4654 was immediately cleared of its 46 passengers and three-member crew upon landing about 7:55 a.m. in Salt Lake City.

"Airport police, fire and FBI personnel moved in to sweep the aircraft, which was parked and secured on the north end of the airfield," Gann said.

Nothing suspicious was found aboard the twin-engine CRJ-200 aircraft.

Skywest spokeswoman Marissa Snow said the threat was called in to the St. George operations center. The origin of the call was not released Thursday.

"When we received word, we acted out of an abundance of caution, as we doing in all such cases, and notified local law enforcement," Snow said.

Neither Gann nor Snow would release further details about the threat, citing the ongoing nature of the investigation and the FBI's involvement. However, Gann did say the "specifics" and the "phrasing" of the threat had caused authorities concern.

Once cleared by authorities, passengers were allowed to continue on to their various destinations early Thursday afternoon.