BELLINGHAM, Wash. - Bellingham International Airport was evacuated as a precaution after a screening swab tested positive for explosives Sunday afternoon.

A Bellingham Police bomb squad was called in and investigating the incident.

A medium black suitcase was later spotted on the sidewalk of a passenger pickup area. A bomb robot was deployed to obtain X-rays of the suitcase. Investigators later determined the suitcase was empty.

About 300 passengers were in the post-screening area at the time. Police said those people are fine and are "far from the area of concern."