Swedish police say a bomb has exploded at a hotel in the city of Vasteras, seriously injuring one person.

Police spokesman Per Stromback describes the bomb as a homemade device made with gunpowder.

He says the device went off in the kitchen of a hotel near the Vasteras airport just after 9 p.m. It caused a small fire that was quickly put out.

Stromback says the hotel is being evacuated. Vasteras is 70 miles west of Stockholm.