U.S. forces launched a raid in central Yemen on Sunday, security and tribal officials said, landing troops off of aircraft and killing three alleged senior al-Qaida leaders in a battle that was the third such U.S. ground engagement against the extremist group in Yemen. The surprise dawn attack in Bayda province killed Abdul-Raouf al-Dhahab, Sultan al-Dhahab, and Seif al-Nims, they said.