The United States military says it killed six al-Shabab extremists with an airstrike in Somalia after the al-Qaida-linked group attacked Somali forces while U.S. forces were nearby. The U.S. Africa Command statement said the airstrike was carried out near Darasalam village in southern Somalia’s Lower Shabelle region after al-Shabab fighters attacked from a building in the area. The statement said three al-Shabab fighters were wounded. No U.S. forces were killed or wounded, the statement said, dismissing an al-Shabab claim of U.S. casualties. Somalia’s government in a separate statement said the U.S. forces were there to advise and assist local ones.