Alarm was received at 03.27 that an object was thrown into the premises on Västra Hindbyvägen in Malmö and the police assess that the object may be dangerous.
We think it could be a hand grenade, but it has not detonated, says Mikael Holmström at the Malmö Police South Sweden.
The National Bomb Squad is on site and investigating the object. It was unclear at 6:30 a.m. when the closures could be lifted.
The police have started a preliminary investigation regarding attempts at public destruction and violations of the Act on Flammable and Explosive Goods.