Four US soldiers were killed Wednesday when gunmen attacked their patrol in northwest Baghdad, the US command said, also announcing the deaths of two other soldiers the previous day. The command said "terrorists" attacked the troops on patrol with "indirect and small arms fire" in the morning, killing four soldiers. The command also announced the deaths of two soldiers Tuesday. One, assigned to 3rd Infantry Brigade Combat Team, 25th Infantry Division, was struck by enemy fire near Kirkuk, 290 kilometers north of Baghdad. He later died of his wounds, the command said in a statement. The other died Tuesday afternoon in a small-arms attack on his patrol in Baghdad, the military said.