Officials at the Minneapolis-St. Paul International Airport evacuated Terminal 2 after a suspicious package was found on Sunday.
The evacuation also closed light rail and vehicle traffic to and from the airport temporarily.
According to officials, a water purifier in a passenger's luggage was the culprit. A similar system prompted a previous evacuation in April.
Passengers in the ticket area were evacuated and sent to baggage claim, but people also gathered in the parking lot.
TSA Agents identified the purifier as a suspicious item at about 4:30 p.m. during inspections in the checked bag area. Officials said a CTX machine also found the item to be suspicious.
The Bloomington Bomb Squad was called to the scene.
After two hours, the airport began allowing people back inside.
Just minutes before the evacuation was ordered, a Delta flight bound for Detroit made an emergency landing at the airport after the plane's windshield cracked.
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