NAIROBI, Kenya (AP) — Six U.S. airstrikes that killed more than 60 people in a coastal Somali town were pre-emptive strikes to prevent a major extremist attack, according to a Somali intelligence officer. The U.S. military said Monday it carried out four strikes on Dec. 15 in which 34 people were killed and two more on Dec. 16 which killed 28. The air attacks targeted Gandarshe, south of the capital, Mogadishu, it said.