MONTOURSVILLE — A Porter Airlines twin-engine turbo-prop en route to Dulles International Airport from Toronto made an emergency landing at the Williamsport Regional Airport about 8:45 a.m. Sunday after smoke was reported in the cockpit.

The Dash 8-400 with 66 passengers and a crew of four landed without incident. The passengers were quarantined in a building away from the terminal until customs agents arrived from Philadelphia.

Because it was an international flight, once passengers deplaned they were required to go through customs before boarding a replacement Porter aircraft, Thomas J. Hart, airport executive director, explained.

Baggage could be transferred without being checked by customs agents because the plane was secured immediately, he said.