A female suicide bomber killed herself on Monday when she exploded a vehicle packed with explosives near a stadium where Nigeria's President had just held an election rally in the northeastern city of Gombe, police said. There were no other casualties.
The explosion occurred in a near-empty area about 1.5 kilometers from the venue, which President Goodluck Jonathan had just left, said Deputy Superintendent Fwaje Atajiri.
Two other suicide bombings in Gombe city on Sunday injured a few people but killed only the bombers, he said. A couple sharing a bicycle blew themselves up at a central traffic circle and a man blew himself up at a timber market. All three bombers died, Deputy Superintendent Atajiri said.
The attacks come as the International Criminal Court's prosecutor urged all contestants to refrain from violence before, during and after the vote, with analysts saying the presidential contest is too close to call.
Frontrunners are President Goodluck Jonathan, a Christian southerner and Muslim northerner Muhammadu Buhari, a former military dictator. Some 800 people died in protests in mainly Muslim northern Nigeria after Mr Buhari lost the last election to Mr Jonathan in 2011.
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