A seventh person has died following a killing spree at a Chinese restaurant in the north German town of Sittensen.

The man was the only one to have initially survived the attack, but died of his wounds in hospital.

His death means investigators have lost their most important witness to the killings, which police are describing as unprecedented.

The victims, some of whom were tied up, have not yet been identified although they are all believed to be of Asian origin. All had been shot dead.

There has been no official word on a possible motive.

A very young child was also discovered in the building, but was unable to shed any light on the crime.

Police are now pinning their hopes on statements from those who were at the restaurant that evening, or who drove past that night. Child found

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." (Source: BBC)