FILE - In this Dec. 8, 2008 file photo, armed al-Shabab fighters on pickup trucks prepare to travel into the city, just outside Mogadishu, in Somalia. A bloody rivalry has emerged in Dec. 2018 between extremist groups in Somalia as the al-Qaida-linked al-Shabab hunts upstart fighters linked to the Islamic State group, officials tell The Associated Press.
FILE - In this Dec. 8, 2008 file photo, armed al-Shabab fighters on pickup trucks prepare to travel into the city, just outside Mogadishu, in Somalia. A bloody rivalry has emerged in Dec. 2018 between extremist groups in Somalia as the al-Qaida-linked al-Shabab hunts upstart fighters linked to the Islamic State group, officials tell The Associated Press. Farah Abdi Warsameh, File AP Photo
FILE - In this Dec. 8, 2008 file photo, armed al-Shabab fighters on pickup trucks prepare to travel into the city, just outside Mogadishu, in Somalia. A bloody rivalry has emerged in Dec. 2018 between extremist groups in Somalia as the al-Qaida-linked al-Shabab hunts upstart fighters linked to the Islamic State group, officials tell The Associated Press. Farah Abdi Warsameh, File AP Photo