Ugandan authorities have discovered an unexploded suicide vest and have detained six individuals suspected of planning the bombings that killed 76 soccer fans. The attacks, carried out by Somali al Shabaab Islamists with links to al Qaeda, targeted a restaurant and a rugby club in Uganda's capital during the World Cup final. A U.S. official stated that there are indications the group's claim of responsibility is credible, marking the first time al Shabaab has attacked outside of Somalia. President Obama described the timing of the explosions during the World Cup as "tragic and ironic." Obama stated that there are two contrasting visions for Africa - one of progress and unity, and the other of destruction and death by groups like al Qaeda and Al Shabaab. The U.S. government is working with Uganda and other regional governments to assess the threat of further attacks and share intelligence for appropriate actions. Despite a warning received by Ugandan intelligence officials, the U.S. government claims to have had no prior knowledge of the attack. According to a source in Uganda, an informant from the Kisenyi suburb of Kampala reported on June 17 that there were plans for an attack during the World Cup by some Somalis. The official mentioned that more than 20 individuals, including Somalis and Ugandans, were involved in planning the attacks. Six people have been arrested so far. Al Shabaab has threatened more attacks unless Uganda and Burundi withdraw their peacekeepers from the African Union peacekeeping force in Somalia, where the militants are in conflict with the government and control significant portions of the country. Police stated that the suicide vest discovered at a third location on Monday was intended to be planted rather than worn. A man named Yonis, who claimed to be the assistant to al Shabaab spokesman Sheikh Ali Mohamud Rage, told Reuters that those who carried out the attack were blessed with rage and expected to have a long life, indicating that it was not a suicide bombing. He also mentioned that al Shabaab has banned alcohol and watching soccer matches in areas under its control, and noted that coordinated attacks are a common tactic of al Qaeda and groups associated with Osama bin Laden's militant network. For al Shabaab, this would mark the first instance of the militants expanding their efforts for power beyond national borders. U.S. Homeland Security Secretary Janet Napolitano expressed concern about this new development, stating that there is a growing awareness of al Shabaab's increased reach. She emphasized the importance of enhancing preparedness, prevention, and interception measures to prevent any potential terrorist attacks. A U.S. official in Washington noted that al Shabaab, which has connections to al Qaeda in East Africa and al Qaeda in the Arabian Peninsula, has been under surveillance by the U.S. authorities. The official stated that the attack in Kampala was consistent with threats to expand targets, but did not directly address whether the group posed a specific threat to the United States. President Obama mentioned in an interview with South African Broadcasting Corp that terrorist organizations do not value African life and see it as a place to carry out ideological battles regardless of the consequences. The African Union confirmed that Uganda would still host a summit of African leaders and remain committed to peacekeeping efforts. IGAD declared they would not be intimidated and would continue to support the government in Somalia, with plans to increase peacekeepers to over 8,000 by the second week of August. Last week, members of IGAD, including Kenya, Uganda, Sudan, Ethiopia, Somalia, and Djibouti, stated their desire for 20,000 troops from the AU and United Nations to be deployed in Somalia. Uganda's opposition party, the Forum for Democratic Change, called on President Yoweri Museveni to withdraw his peacekeepers and indicated that they would do the same if they won the 2011 elections. The party spokesperson, Wafula Oguttu, expressed that there is no peace to maintain in Somalia and that Uganda has no strategic interests in the region. He criticized the sacrifice of Ugandan soldiers in Somalia as being without purpose. Some analysts believe that a sustained bombing campaign could harm Uganda's investment climate, but a single attack was unlikely to deter major companies like Tullow Oil from investing in the country. Foreign investment in the third largest economy in East Africa has increased significantly due to oil exploration along the western border with the Democratic Republic of Congo. Among the casualties, one American was killed and five others were injured and taken to Johannesburg and Nairobi for treatment. The U.S. State Department reported that an FBI team is currently in Kampala.