An update on the above post by the BBC:
A top Islamist in Somalia, Sheikh Hassan Dahir Aweys, has arrived in the capital Mogadishu amid reports of a split in the al-Shabab group. He was flown from the northern town of Adado, escorted by government security forces, but it is unclear whether he has surrendered or defected.

The exact cause of the al-Shabab split is not known, but there has been a long-running internal power struggle between its leader Ahmed Abdi Godane and those seen as more moderate who oppose links with al-Qaeda, analysts say.
Link:http://www.bbc.co.uk/news/world-africa-23115819