By Johan AhlanderOREBRO, Sweden (Reuters) -Ten years ago 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.

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