According to the BBC, at least 21 people were killed in Damaturu when a suicide bomber in a tricycle taxi set off explosives during Brazil's match against Mexico. At least 27 people are believed to have been seriously injured
Other outlets are reporting fewer casualties, but the BBC reports that a hospital worker said that he had "personally counted 21 bodies."
Soccer has been deemed an un-Islamic activity by Boko Haram.
Although no group claimed credit for it, a similar attack on June 1 killed at least 14 people who were watching a soccer match on television at a bar in Adamawa.