A suicide bomber carried out at least one of the twin attacks that killed 73 people in Kampala at the weekend, Ugandan officials said Wednesday, adding that six suspects had been arrested. Somalia's Al-Qaeda-inspired Shebab militia claimed the attacks and police have already found an unexploded suicide vest at another site, seen as evidence of a botched plan for a third bomb strike. One militant blew himself up at an Ethiopian restaurant in Kabalagala, a southern Kampala district, where crowds had gathered to watch the World Cup final on Sunday night, while the other attack targeted a sports bar. 'We can confirm at least for the case of Kabalagala that it was a suicide bomber,' State Minister for Internal Affairs, Matia Kasaija, told selfnews. Police spokeswoman Judith Nabakooba said six suspects were being questioned over the attacks. 'We have got six,' she told reporters when asked how many suspects had been arrested. Nabakooba said police had rushed to six areas in the capital on Wednesday to probe suspected explosive devices, but none turned out to be real, adding: 'The public level of awareness and cautiousness has been raised.' Government spokesman Fred Opolot revised the death toll down to 73, from a previous official toll of 76. Opolot also said that Kenyan authorities last week handed over a Ugandan man suspected to have links with the Shebab. 'He was arrested in Nairobi last week and turned over to Ugandan police yesterday,' he said. The Shebab said the attack was in retaliation for the presence of Ugandan troops in the African Union peacekeeping mission in Somalia, where the AU is propping up the government. Highlighting fears after the Shebab's claim of responsibility, a French citizen of Somali origin was denied entry when he arrived at Entebbe airport from London, a security source said. 'He has been told to return to London today,' said the official who decline to be named. On Tuesday police chief Kale Kayihura said a suicide vest -- laden with explosives and fitted with a detonator -- had been found packed in a black laptop bag at a club in Kampala's Makindye district on Monday. 'We have established that what was found at the discotheque was in fact a suicide vest, and it could also be used as an IED' or improvised explosive device, he told reporters. While the bombers' actions appeared to support the Shebab's claim of responsibility, the police chief pointed a finger at a homegrown Muslim rebel group known as the Allied Democratic Forces (ADF). 'Shebab is linked with ADF,' he said. 'ADF is composed of Ugandans, Shebab and ADF are linked to Al-Qaeda.' Ismael Rukwago, a senior ADF commander based in the Democratic Republic of Congo, denied any involvement. 'We are not part of this thing, we are absolutely denying. We have no reason, these are innocent people,' he told selfnews by telephone. US President Barack Obama, leveraging his African heritage, has condemned the attacks -- the deadliest in East Africa since the 1988 bombings of US embassies in Kenya and Tanzania. 'What youve seen in some of the statements that have been made by these terrorist organizations is that they do not regard African life as valuable in and of itself,' Obama told the South African Broadcasting Corporation. 'They see it as a potential place where you can carry out ideological battles that kill innocents without regard to long-term consequences for their short- term tactical gains,' said the US leader, whose father was Kenyan. The Ugandans were the first to deploy to Somalia in early 2007. Ugandan State Minister for Foreign Affairs Okello Oryem, speaking on local radio, suggested it was time for more robust action on the part of the AU mission in Somalia. 'The Shebab might have made a grave mistake by what they did here... We need now to be more aggressive. There is need for the mandate of foreign troops to be changed,' he said on local radio late Tuesday. 