Somalia’s al Shabaab militant group has claimed responsibility for twin suicide bombs in the country’s Puntland region.<br /><br /> More than 20 people were killed on Sunday when the bombers detonated the explosions at a market and government building in the semi-autonomous territory.<br /><br /> People living in the town of Galkayo said they heard two loud blasts in quick succession followed by heavy gunfire. Witnesses said the first was a truck bomb, followed by a car bomb. <br /><br /> Experts and officials say Al Shabaab has become more active in Puntland since moving more forces there.<br /><br /> An African Union force and the Somali National Army had pushed the group out of strongholds further north.<br /><br /> Al Shabab controlled Mogadishu for several years before it was driven out by African Union forces.<br />