Patrons of a Kampala, Uganda, restaurant react after a bombing Sunday.

A Somali Islamist militant movement on Monday claimed responsibility for a trio of bombings that killed at least 74 people Sunday at two venues in the Ugandan capital where crowds had gathered to watch the World Cup final.

"And the best of men have promised and they have delivered," said an Arabic statement issued by Al-Shabaab's press office. "Blessed and exalted among men - (taking) full responsibility ... We wage war against the 6,000 collaborators; they have received their response."

The 6,000 is an apparent reference to African Union peacekeepers in Somalia. Uganda contributes troops to the peacekeeping effort.

"We are behind the attack because we are at war with them," Al-Shabaab spokesman Ali Mohamoud Rage told reporters at a news conference in Mogadishu, Somalia.

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