Last year a pig's head was placed outside a mosque in Trollhättan in western Sweden. Many mosques reported cases of vandalism and racist graffiti.
Helena Hummasten, chair of the Swedish Muslim Council, said there is an urgent need to assess the threat levels to Muslim institutions in Sweden.
"Many of these facilities are not safe. It's just a matter of time before someone gets injured or worse," Hummasten told Swedish Radio.
According to a report from five years ago, four in ten Muslim organisations had been subjected to criminal activity, and Hummasten said that the situation could be even worse today.