The death toll from two bomb blasts in Uganda's capital as people watched the World Cup final has risen to 64.

Bombs exploded at two sites in Kampala during the game between Spain and Holland. The deadliest attack occurred at a rugby club as people watched the game on a large-screen TV outdoors. The second blast took place at an Ethiopian restaurant.

Police chief Kale Kaihura said he believed al-Shabab, Somalia's most feared militant group, could be responsible. Al-Shabab has pledged allegiance to al Qaida.

Mr Kaihura had earlier put the death toll at around 30, but a police officer at the scene said the toll had risen to 64.

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 last 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.

During prayers on Friday, another al-Shabab commander, Sheik Muktar Robow, had called for militants to attack sites in Uganda and Burundi - two nations that contribute troops to the African Union force in Mogadishu. In addition to its troops in Mogadishu, Uganda also hosts Somali soldiers trained in US and European backed training programmes.