Authorities today released the name of a man fatally shot during an exchange of gunfire that also left a California Highway Patrol officer injured at an Oakland Walgreens store Wednesday morning.Maurice Evans Shavers Jr., 21, was shot to death by officers after he opened fire at officers who had responded to the robbery at about 1:30 a.m., Oakland police spokesman Jeff Thomason said.The officer who was shot during the incident, a man in his 20s who has been with the California Highway Patrol for about a year, remained in critical but stable condition today, CHP Sgt. Trent Cross said.A manager at a Walgreens at 5505 Telegraph Ave., in the Temescal Plaza shopping center, had flagged down two CHP officers in a patrol car to report the robbery was in progress, Thomason said. Oakland police were called to the store as well.The CHP officers parked behind the store, where they heard banging sounds that could have been gunshots coming from inside, Thomason said. The two officers were still behind the store when they were confronted by a man with a gun, he said.The suspect shot at the officers and they returned fire, according to Thomason.Cross said this afternoon it has still not been determined whether the officer may have been injured with friendly fire, or if the suspect had shot him.After shooting at the officers, the gunman ran to the front of the store, where he was confronted by a group of Oakland police officers who had surrounded the entrance, Thomason said. The officers shot and killed the gunman.Police Wednesday night arrested a second suspect, 40-year-old Alphonso Mitchell, on suspicion of robbery and kidnapping in connection with the incident, Thomason said.