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Sweden itself was dealing with the aftermath of "the terrible incident in Orebro", she noted, referring to Sweden's worst mass shooting last month in which a gunman attacked an education centre in central Sweden, killing nine people.

All of the victims lived in Orebro, but so far authorities have declined to share their identities or any other details about them.

Isker's fiancee Kareen Elia, 24, attended a memorial service in Orebro on Thursday night along with his mother and other members of his family.

A national of Bosnia and Herzegovina was killed and another was injured, the Bosnian foreign ministry said, citing information shared by Orebro residents.

Members of Orebro's Middle Eastern immigrant communities have told the BBC they are feeling vulnerable and have been taking additional precautions in the days since the attack.