The Haugesund Airport on Norway’s southwestern coast had been closed since late Friday after airport staff found a suspicious piece of luggage in a handicap toilet in the departure hall. An alarm, that had been set off in the same restroom just moments earlier, alerted the attention of the police.

Chief Police inspector Trond Friberg said that the combination of the two events led to police taking the situation more seriously than usual. “It could be seen as if the alarm had been activated to lure someone into a trap,” Friberg said.

He added that just as the airport was opening again, the mother of the bag’s owner had contacted police, explaining how one of her two children had set off the alarm, while the other had forgotten its school bag as they rushed to catch their flight — the last one going out on Friday.

The airport closure led to one cancelation and delays for two others. It was not clear how many passengers were affected by the incident.