Nwakpa O. Nwakpa, a spokesman for the Nigerian Red Cross, said volunteers offered first aid to the wounded, and evacuated those seriously injured to local hospitals. A survey of two hospitals by the Red Cross showed at least 50 people were injured in Friday's attack, he said.
A Boko Haram spokesman using the nom de guerre Abul-Qaqa claimed responsibility for the attacks in a message to journalists Friday. He said the attack came because the state government refused to release Boko Haram members held by the police.
British Foreign Secretary William Hague said Saturday that he was "shocked and appalled" by the attacks in the former colony.
"The full horror of last night's events is still unfolding, but we know that a great many people have died and many more have been injured," Hague said in a statement. "The nature of these attacks has sickened people around the world and I send my deepest condolences and sympathies to the families of those killed and to those injured."
The U.S. Embassy said it had canceled all staff travel to northern Nigeria after Friday's attacks.
President Goodluck Jonathan also condemned an attack he said saw innocent people "brutally and recklessly cut down by agents of terror."
"As a responsible government, we will not fold our hands and watch enemies of democracy, for that is what these mindless killers are, perpetrate unprecedented evil in our land," Jonathan said in a statement. "I want to reassure Nigerians ... that all those involved in that dastardly act would be made to face the full wrath of the law."