In separate raids, U.S. Navy SEALs carried out a predawn strike in Somalia aimed at capturing a senior leader of the al-Shabaab militant group, while a group of U.S. commandos in Libya captured a man suspected of taking part in the 1998 American Embassy bombings in east Africa.

The raid in Somalia Friday failed to capture the senior militant and it isn't clear if he was killed, although several al-Shabaab members were killed, according to an official. But the U.S. military, in an operation with the CIA and FBI, succeeded Saturday...