The suspected gunman, who was among the dead, was named in media reports as Rickard Andersson, 35, a former student of the school who lived locally.

The police responding to the attack encountered firing so intense that they struggled to tell how many gunmen were on the scene, an official said.

Officials in Sweden have vowed to determine why a man killed 10 people, and apparently himself, in an unprecedented attack that's shaken their "society to its core."

Salim Iskef, 29, fled the Islamic State and Syria to form a better, more secure life in Sweden, only to be gunned down this week in the worst mass-shooting in Swedish history.

Swedish police said they were still investigating the motive behind the country's deadliest mass shooting, as local media began reporting details about the gunman. The suspect, named in reports as 35-year-old local man Rickard Andersson,

Sweden does not allow just anyone to own a gun, so how did Wednesday's tragedy occur? Eleven people were killed in Orebro at a school for adult learners, Risbergska Adult Education Center. Reuters reported that six others were wounded and required treatment at a hospital.