The bodies of six people - three men and three women - have been found in a Chinese restaurant in the town of Sittensen, in northern Germany.
Police have appealed for help from visitors to the Lin Yue restaurant
German police say the victims had been shot dead and some had been tied up.
Police were alerted by the husband of one victim, who had gone to the Lin Yue restaurant to collect his wife.
A restaurant worker, critically wounded in the shooting, is now in hospital. Police say the victims have not yet been identified.
But a police spokesman said they were "in all probability Asian". There has been no official word on a possible motive.
The bodies were found late on Sunday night in several rooms in the restaurant, police said.
"This morning at 1230 (2330 GMT) a man wanted to pick up his wife from work there. He discovered several dead bodies, among them his wife," said police spokesman Detlev Kaldinski.
"He called the police and a manhunt got under way, sadly without success."
He said a very young child was also discovered in the building, but was unable to shed any light on the crime.
Local police have asked federal specialists to join the investigation, and have also appealed for anyone who visited the restaurant or passed by on Sunday to come forward with information.
Sittensen is a small town situated south of Hamburg, in the state of Lower Saxony.
The town's Mayor Stefan Tiemann said the family that owned the restaurant were well known in the local community, and had lived above the restaurant for nearly a decade.
Local resident Hilly Behrens said: "They're really nice people - I've never seen an angry face there."
The restaurant had never been suspected of involvement in criminal activity and Chinese mafia violence "has never been an issue in Lower Saxony", said a police spokesman.