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ONONDAGA COUNTY, N.Y. -- Officials are still trying to figure out what went wrong aboard an Air Canada Beech 1900 that made an emergency landing Friday morning at Hancock Airport, shortly after taking off on a flight to Toronto.

A battery powered smoke detector aboard the plane sounded and the two person crew decided to return to Hancock. What's unclear is if something triggered the alarm, or if the detector had malfunctioned.

“Everyone was taken off the aircraft. And our airport rescue fire fighting division responded to the scene, conducted an investigation and they're currently trying to determine what the cause was,” said Christina Reale, Syracuse Aviation Commissioner.

The plane, which was carrying only four passengers at the time, landed without incident.