Two American soldiers were killed Thursday in separate attacks in Baghdad - one a bold daylight shooting at close range and the other a sniper attack, US officials said. In addition, at least one soldier was injured when a U.S. vehicle hit an explosive in part of the capital believed to have been cleared of land mines. The incidents demonstrate Iraq is still fraught with danger for U.S. forces a month after Saddam Hussein's government fell. In the most brazen attack, an Iraqi walked up to a soldier on a bridge and opened fire with a pistol at close range, according to senior U.S. Army officers in Baghdad who had heard reports of the shooting. The officers said the slain soldier, whom they did not identify, belonged to the 2nd Armored Cavalry Regiment from Fort Polk, La. Calls to that regiment's public affairs officer here went unanswered Thursday night. No further information was immediately available, and it was unclear what happened to the unidentified assailant. U.S. Central Command in Qatar said it was unaware of the incident. U.S. forces say they trade fire with armed Iraqis almost daily across the country. Still, an incident like the one on the bridge is highly unusual even in postwar Iraq. In the second attack, a U.S. Army 3rd Infantry Division soldier was killed when a sniper shot him in the head in east Baghdad, said Capt. Tom Bryant, spokesman for the Army's V Corps, which is based at Baghdad's airport. He had no further details. Also Thursday, an American Humvee hit a "probable land mine" while crossing a median in a road near Baghdad's airport, Bryant said. Details were sketchy, but at least one U.S. soldier was injured in that incident. Other incidents have bedeviled U.S. forces in recent days, though none cause casualties. On Wednesday, the military said, two Iraqis shot at reconnaissance elements of the 3rd Infantry Division with small arms and rocket-propelled grenades as they traveled north of Baghdad. The unit returned fire, the military said, killing one assailant. Also Wednesday, near the northern town of Baiji, a convoy from the 4th Infantry Division came under rifle and machine-gun fire. The unit attacked the assailants' positions and captured five suspects and their weapons, Central Command said. **PHOTO CAPTION*** US Troops in Baghdad Thursday, May 8, 2003 (Reuters)