According to the police, the situation is stable for all five, and there appears to be no connection between them, other than the fact that they were all on the scene.
A 22-year-old Italian woman was killed when one or more perpetrators fired shots on the scene in Aarau at 2:30 a.m. on Sunday night.
A man in his 40s has been arrested on suspicion of the crime, police announced.
The arrest was made just before 1 a.m. last night. The man is from Switzerland, according to the newspaper Aargauer Zeitung, and is believed to have acted alone.
The police have previously stated that they are working on three hypotheses: a terrorist attack, mass murder and a common criminal act. On Sunday, police found ammunition from two weapons - a submachine gun or pistol and a more powerful rifle.
