The article eventually says this: "Almost a third [of the blasts] have taken place in Malmö, scene of a string of increasingly violent gun and bomb attacks tha

The article eventually says this: "Almost a third [of the blasts] have taken place in Malmö, scene of a string of increasingly violent gun and bomb attacks that rightwing politicians have linked to the large flows of immigrants who arrived in in Sweden during the 2015 migration crisis." It does not say what fraction of the bombs were made by immigrants. A country does have the right to revise its immigration policy based on its experiences, so this is a relevant statistic.