Two bombs exploded Thursday at Moscow offices connected with the auto-manufacturing giant Logovaz.The attacks came a week after the company's general director, Boris Berozovsky, was wounded and his driver killed in a car bombing outside his office near Paveletsky train station last week. In a separate incident, three people were killed and one wounded in a mafia-style shooting outside the office of Credit-Consensus Bank on Leningradskoye Shosse, NTV television reported.At about 3:45 P.M. a lone gunman armed with an AK-47 automatic rifle opened fire on a black Mercedes outside a research institute across the road from the bank, killing the driver immediately and two other passengers as they tried to escape, the report said.The attack took place an hour after an unidentified man threw a small explosive device in the second-floor window of the offices of Obyedinyonny Bank, which was founded by Logovaz Bank, just off Stary Arbat, police said.The device bounced off the window's railings and exploded in mid-air. The blast shattered glass from several windows, sending shards onto the street that injured one woman.Logovaz spokesman Alexander Mitroshenkov said he believed the bombing was the work of "hooligans," rather than a planned attack on the company, and that Stary Arbat was the site of almost daily bombing incidents.At a branch of Logovaz on Ulitsa Molostovykh in eastern Moscow, an unidentified man threw a bomb into the entrance of the firm's first floor offices at 2:30 P.M., Commonwealth television reported. Police said there were no casualties.Large businesses have become targets for attacks by gangs who demand extortion using terror tactics, prompting President Boris Yeltsin to decree tough anti-crime measures.