"I came from my room to see what was happening. I saw the fire and ran outside," said Dawit, a 13-year-old Ethiopian boy living in a Swedish center for asylum seekers.

His voice is steady and lacking emotion, but the arson attack on his temporary home for unaccompanied children has cast a shadow over his hopes of living in safety one day.

At least 25 centers for asylum seekers in the Scandinavian country have been reduced to ashes or damaged by fires this year, often set in the dark of night while the migrants sleep, unaware of the danger they are in.