Swedish police on Thursday described Tuesday’s school shooting as a “hellish” event that left 11 people dead, confirming that the suspected perpetrator was found dead with three licensed firearms in his possession.

Witnesses who survived Sweden’s worst mass shooting have described horror and panic that gripped an adult education center west of Stockholm as the gunman killed at least 10 people.

The king and queen visited the scene of the tragic event that occurred on Tuesday and Swedish flags were flown at half-mast to honor the victims.

The Swedish police reported that the alleged perpetrator of the shooting in Orebro possessed a permit for four firearms. Three of these were found on him, along with a large quantity of unused ammunition.

By Johan Ahlander and Simon Johnson OREBRO, Sweden (Reuters) -Swedish police found three rifles near the body of the gunman amid a chaotic scene they described as an "inferno" after 11 people were killed and several wounded in the country's deadliest mass shooting,

The facility offers adult courses, including Swedish language classes for immigrants. Law enforcement officials say the shooter, who Swedish media have identified as 35-year-old Rickard Andersson, may have been a student at the center.