Five residents were killed on Wednesday when a man with a bow and arrow descended on Kongsberg, a Norwegian town of roughly 28,000. The assailant also wounded two, including an off-duty police officer, local authorities told reporters. A suspect, whose name was not been released but whom police identified as a 37-year-old Danish man living in Kongsberg, has been apprehended. He is believed to have acted alone. He has not yet been questioned, according to the AP.

“The reports coming from Kongsberg tonight are horrifying,” Acting Prime Minister Erna Solberg told reporters, saying it was too early to speculate as to the suspect’s motive. Kongsberg’s police chief said the force will look into whether the incident could be considered an act of terrorism. The death toll from what the chief called “multiple crime scenes” was the worst of any attack in Norway since 2011, when a far-right extremist killed 77, many of them teenagers.