Investigators had not uncovered a definitive motive behind the bloodshed by Thursday. Police said there were no warnings beforehand, and they believe the perpetrator acted alone. Authorities said there were no suspected connections to terrorism at this point.

At least ten people have been killed in a school shooting in the central Swedish city of Örebro on Tuesday, according to authorities. Swedish police said they believe the suspect — a man — to be among the dead. They said the perpetrator acted alone but added the investigation was still in its early stages.