Maiduguri explosion
Suspected Boko Haram militants kill 15 in Nigeria's Maiduguri
Maiduguri is the epicentre of the nine-year conflict with Boko Haram that has killed more than 20,000 people.
The kidnappings were part of a campaign of attacks last year by the jihadist group whose bid to create an Islamic state in the northeast.
There were at least two attacks in Maiduguri, Borno state over the weekend.
The evening attack, which also injured five people, struck the city’s Muna Garage area, Damian Chukwu, a police commissioner, told Reuters.
The woman detonated her bomb while trying to enter the mosque in the centre of Maiduguri, shortly before early morning prayers.
The blasts struck four areas in the city, which is the capital of Borno, the state worst affected by the eight-year-old insurgency by Islamist militant group Boko Haram.
A number of suicide bomb attacks by suspected members of the jihadist group have taken place in the capital of Borno state.
The suicide bombers targeted two petrol haulage trucks parked near a filling station along Damboa Road.