Sweden’s security police raised its terror threat level to the second highest and increased counter-terrorism operations after receiving “concrete” information.
“Right now there’s full focus on the operative work,” the Stockholm-based Security Service said in a statement. The threat level was increased to “high,” or to 4 from 3.
Prosecutors have also started a preliminary investigation into preparations to commit terrorism. At a later press conference, police said they are searching for a suspected terrorist on the loose in Sweden.
The alert comes as French authorities have battled it out with suspecting terrorists linked to Islamic State following attacks on Friday that killed 129 people and injured more than 300. France is also intensifying bombing of the group’s positions in Syria.
Sweden has a “large number” of people that have returned from fighting in Syria and Iraq, according to the security service. Even more people could also return to the Nordic country, it said.