RAWALPINDI, Feb 4 (Agencies): A suicide bomber on a motorcycle rammed into a bus carrying defence forces personnel, detonating a blast Monday that killed six people and wounded 30 others in Rawalpindi's R.A.Bazar area, police said. The bomb went off during the morning rush hour outside the army's National Logistics Cell, where the army has its headquarters. The bus was destroyed and several people wounded in the explosion, police official Abdul Waheed said. Several vehicles were badly damaged. An eye witness said a bus carrying army medical trainees had been targeted. He said about 25 people had been injured. Television footage showed the mangled wreckage of the vehicle, which troops later covered with a white tent.