Berlin - A plain clothes police officer shot dead a 27-year-old Romanian man on Tuesday during a vehicle check in the northern German port of Hamburg, police said.
Police said they were investigating the plain clothes officer on suspicion of acting negligently.
"There is no indication that the officer was acting in self defence," said a police spokesperson, who declined to give further details, saying the circumstances of the incident were unclear.
A bullet from a police officer's gun shot through one of the car's rear windows and killed the Romanian who was in the driver's seat, the spokesperson said.
An accompanying passenger, also Romanian, was unhurt but arrested on the spot on suspicion of fraud. Police found several forged cheque cards in the vehicle, which German media reported had British licence plates.