Paramedics attend to an unidentified U.S. citizen at Mulago Hospital in Uganda's capital Kampala July 11, 2010. [Xinhua/Reuters Photo]

Somalia's Al Shabaab Islamist movement has claimed responsibility for the deadly Kampala twin bomb attacks, a senior official from the movement said on Monday.

So far, more than 70 people have been killed after twin bomb explosions targeting football fans rocked local restaurants in Kampala, Uganda's capital, on Sunday night.