A gunman who killed 11 people, including himself, at an adult education centre in central Sweden may have been a student at the school, police said on Thursday, as they described chaotic scenes after the country's deadliest mass shooting as being like an "inferno".

Swedish police say the shooter who killed 10 people in the country’s worst mass shooting was connected to the adult education center where he opened fire with at least one rifle-like weapon.

All of the victims lived in Orebro, but so far authorities have declined to share their identities or any other details about them. Police also confirmed on Friday that the suspected gunman was a 35-year-old man from the area.