Four U.S. soldiers were killed in separate incidents Saturday in Baghdad - three of them by small-arms fire, the U.S. military said, according to DPA. One incident was in the Yusifiyah district in the southwest of the capital while another occurred northwest of the capital. The fourth soldier was killed when his patrol struck a roadside bomb in the Adhimiyah district in north Baghdad. The military announced Saturday the death of another soldier in Abu Ghraib in the west of Baghdad. That incident, which occurred Friday, injured 11 other soldiers and one Iraqi civilian.