Russian investigators said a Moscow regional police chief has killed three people and seriously wounded four others after opening fire on the street and in a supermarket in the city. Federal investigators said the suspect, who heads a southern Moscow police department, opened fire Sunday night. They said Maj. Denis Yevsyukov killed the driver of a car in which he was a passenger. Yevsyukov then entered a supermarket and shot to death the cashier and a customer, before shooting at other passers-by. Of seven others whom Yevsyukov shot, four were reported to be in critical condition. Moscow's police chief, Vladimir Pronin, told Russian television Yevsyukov had family problems.