Nigeria borno state
Islamic State says it killed 20 Nigerian soldiers -statement
The assault, which raised questions about government claims to have almost defeated the insurgents, took place in the town of Kareto on Wednesday.
They said the blast occurred in the Damboa local government area in the south of the state, which is at the epicentre of an Islamist militant insurgency.
On Wednesday, 11 people were killed when a suicide bomber attacked a mosque at Gamboru town in the Gamboru-Ngala local government area of Borno state.
Police PR officer Victor Isuku said the restriction would be applied to the use of cars, tricycles, bicycles and animals - until after the Eid congregational prayer on 1 September.
One of two girls with explosives on their bodies detonated a device which also killed her partner whose device failed to explode.
The attack comes just days after security had been heightened in the oil-rich Niger Delta region.
The army, in a statement, said the girl was among 97 women & children held hostage by Boko Haram.
Nkeki is one of the Chibok schoolgirls abducted in 2014 by Nigerian terror group Boko Haram.
Amnesty said more than 350 people were believed to have been unlawfully killed by the military.
Boko Haram controlled a swath of land in northeast Nigeria around the size of Belgium at the start of 2015.
78 people were also injured in the attack which happened at an internally displaced persons camp.
Officials say the attack happened in the community of Dalori, about 5 km east of Maiduguri in Borno state.
Boko Haram seized the girls from their dormitories in the northeastern town of Chibok in April 2014.
The attacks came a day after the army fought Boko Haram militants west of Maiduguri, capital of Borno state.
Soldiers stopped suspected Boko Haram fighters in Aldawari village on the outskirts of Maiduguri.
The explosion rocked a fruit & vegetable market beside a main road in the city of Yola.
No one claimed responsibility but the use of suicide bombers bears the hallmark of Boko Haram militants.
In the latest violence, 56 people were killed by suspected Boko Haram gunmen at a village in Borno state.
Officials said one Nigerian soldier died while 10 militants were killed and another five captured.