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An unattended bag at Minneapolis-St. Paul International Airport tested positive for explosives, and forced the closure of a portion of Terminal 1 for more than an hour Saturday.

However, it turned out there were not actually explosives inside.

The bag was found near the United ticketing counter, the airport tweeted around 1 p.m., leading to the evacuation of that area.

About an hour later, the

" target="_blank">airport tweeted the package tested positive for explosives.

But Sgt. Tom Williams with the Bloomington Police Department told BringMeTheNews the bomb squad later found nothing inside except personal effects, and they aren't sure what caused the preliminary test to come back positive.

Around 2:20 p.m., MSP said the scene had been cleared and all areas were again open.

WCCO reports officials believe it was left on the weighing machine by accident.

Williams said the bag and its contents were turned over to Airport Police.

American, U.S. Airways, Spirit, Frontier and United were all affected by the evacuation, the airport said, and suggested passengers traveling those companies call for updates.

MSP warned about long lines at the ticketing counter.