Afghan troops killed four suspected Taliban at a checkpoint in southern Afghanistan, while two gunmen on a motorbike shot and wounded an administrator in the region’s main city, officials said Tuesday. A rocket landed in downtown Kabul on Tuesday night next to the headquarters of the capital’s NATO-led peacekeepers and close to the U.S. Embassy. One Afghan was injured. President Hamid Karzai met Tuesday in Washington with President Bush, who outlined security and cultural initiatives to help Afghanistan move toward peace and prosperity. Six men in a pickup truck failed to stop late Monday at the checkpoint in the Hazar Boosth area of Zabul province, 190 miles southwest of Kabul, Gov. Jan Mohammed Khan said. Full Story