The Ethiopian government has revealed that terrorists who had planned to blow up the game between Nigeria and Ethiopia had accidentally blown themselves up. The explosion on sunday happened in the upscale Bole district of the capital, about 5km(3miles) from the Addis Ababa stadium where thousands of fans were gathering for the match. "They were Somali nationals and plotted to carry out a suicide attack disguised as fans on either the stadium or areas where large crowds gathered to watch the match", government spokesman, Shimeles kemal said. Explosive arms, hand grenades and football shirts were found at the scene of the blast, at a residential address an hour before kick-off, Shimeles said. According to the Ethiopian government, three(3) suspects have been detained. The Bole district has a small Somali refugee community. "Heavy police presence must have caused their nervousness and state of agitation which led to the detonation that caused their own death", Shimeles said. Report suggest that there was no immediate claim of responsibility regarding the incident. Somalia's al shabaab Islamist rebels have vowed to exact revenge on Ethiopia for sending troops to Somalia to fight the al Qaeda-linked militants, alongside African union forces from Uganda, Burundi, and Kenya respectively. Ethiopian government says they've thwarted attacks over the past two(2) years which was blamed on domestic rebel groups as well as the Somali insurgents. However, it has so far been spared the sorts of attacks carried out in nearby countries, such as the siege at the Nairobi shopping mall complex last month and an attack on football fans in Uganda in 2010.