Europeans are reportedly among at least 30 people killed when bombs exploded at two sites in Uganda's capital as people watched the World Cup final on TV.

The Europeans and other foreigners, possibly Americans, were believed to be among the casualties.

Police Chief Kale Kaihura said he believed Somalia's most feared militia al-Shabab, which has pledged loyalty to al Qaida, could be behind the attacks.

One of the bombs went off at an Ethiopian restaurant in Kampala - al-Shabab views Ethiopia as an enemy. The second blast went off at a restaurant called the Kyadondo Rugby Club.

Mr Kaihura said 14 people were killed at the restaurant and that he believed the toll at the Rugby Club was far higher.

At the scenes of the two blasts chairs were overturned and blood and pieces of flesh littered the floor.

Al-Shabab is Somalia's most dangerous militant group, one that militant veterans of the Afghan, Pakistan and Iraq conflicts have helped train, according to international officials.

If the suspicions that al-Shabab was responsible prove true, it would be the first time the group has carried out attacks outside of Somalia.

In Somalia's capital Mogadishu, Sheik Yusuf Sheik Issa, an al-Shabab commander, said late on Sunday night he was happy with the attacks in Uganda but refused to confirm or deny that al-Shabab was responsible.

"Uganda is one of our enemies. Whatever makes them cry, makes us happy. May Allah's anger be upon those who are against us," he said.