The two deadly injured victims are women.
Bodgan Oprita, coordinator of emergency and resuscitation service SMURD Bucharest, said earlier that four of the victims have severe injuries.
Prosecutor Marius Iacob said the attacker, who fled the scene of the crime, has been caught. He has been detained on charges of murder and will be heard by prosecutors.
According to people familiar with the matter, police officer Gheorghe Vladan opened fire on his wife and her colleagues, hairdressers in the respective salon.
Vladan’s wife had filed for divorce and the two were to appear in court on March 7.