Al-Shabaab rebels claimed responsibility for the attack, which spokesman Sheikh Abdiaziz Abu Musab said killed 15 security force members.
--snip--
The group, which the United States has designated as a terrorist organization, hopes to turn Somalia into a fundamentalist Islamic state by force.
MORE: http://www.cnn.com/2014/02/27/world/africa/somalia-car-bomb/index.html
See also...
Al-Shabaab militants attack Somali presidential palace in Mogadishu
http://www.cnn.com/2014/02/21/world/africa/somalia-attack/index.html
Car bomb hits U.N. cars, kills 2 near Mogadishu's airport
http://www.cnn.com/2014/02/13/world/africa/somalia-car-bomb/index.html