MOGADISHU, Somalia ? Somalia's Islamic extremist rebels, al-Shabab, named Abu Ubeid Ahmed Omar to be their new leader following the killing of previous leader by a U.S. airstrike, said a commander of the group. The Somali militants unanimously selected Omar on Saturday at a meeting in an undisclosed location in Somalia, said rebel commander Abu Mohammed. Omar is believed to be an assumed name, and the new leader's real name is not known. Al-Shabab also stated that it...