Part of Terminal One of the Minneapolis-St. Paul International Airport was evacuated Saturday after the Bloomington Police Department received a call about an unattended bag.

About noon, the Bloomington bomb squad responded to the call about a backpack testing positive for explosives. By 2 p.m. Saturday, the situation was determined all clear and no explosives were found in the bag.

Airport spokeswoman Melissa Scovronski said some ticket checkpoints had to be closed down during that time.

“We are investigating who might have left it there,” Scovronski said.

Airlines affected by the incident included American, US Airways, Spirit and Frontier.