The suspected Boko Haram attack occurred in the town of Sabon Gari in Borno state on Tuesday afternoon - sources told Al Jazeera's correspondent in the state capital that a female suicide bomber was responsible for the blast.
Speaking in Washington DC on Wednesday, newly inaugurated Nigerian president Muhammadu Buhari said that the United States refusal to sell arms to Nigeria amounted to the American government aiding and abetting the terror group Boko Haram.
Nigeria's military has been accused of human rights abuses by Amnesty International.
The Leahy Law prevents the U.S from providing weapons to country's accused of human rights violations, except when wavered by the Secretary of State in 'extraordinary circumstances'.
Muhammadu Buhari, who has been critical of the military's efforts to tackle Boko Haram militants, sacked Nigeria's chief of defence staff, chief of naval staff, chief of army staff, chief of air staff and named a new national security adviser on Monday.
Useful Resource: Vanguard report
The attack, which has the hallmarks of Boko Haram, targeted a government building in the city of Zaria.
Witnesses told BBC News that primary school teachers were among the people queuing up outside the building seeking employment.
Eyewitnesses tell the news agency of a five hour attack on Saturday in the town of Gubio in Nigeria's Borno state in which 43 people were apparently killed and around 400 houses set alight by the terror group.