A manhunt is under way in western Germany, after three bodies were found in a residential building in Weitefeld, in the Westerwald region.
Police have advised residents in the surrounding area to stay at home, and warned people not to pick up hitchhikers, local media report.
German outlet Bild reports that a police helicopter has been deployed and vehicles entering and leaving the town are being checked.
Details about those killed have not been released.
A police spokesperson reportedly told Bild that the emergency call came in at 3:45am local time (2.45am BST).
Weitefeld is home to around 2200 people.