Islamic militants killed another leader of the underground church movement in Somalia, sources said. Before he was fatally shot May 4 in Xarardheere, about 37 miles from Jowhar, 57-year-old Yusuf Ali Nur had been on a list of people the Islamic extremist group al-Shabaab suspected of being Christian, sources said. Al-Shabaab, said to have links with al-Qaida, has vowed to…