Simultaneous bombs have exploded at a bus station and opposite a university in the central Nigerian city of Jos, a witness has told Reuters news agency.
"There was a loud explosion opposition the university along the Bauchi road, and another one at the Bauchi road motor park," Garba Musa, a newspaper vendor along the road, told Reuters by telephone.
At least 26 people have been killed and dozens injured in suicide bomb attacks at two different bus stations in Nigeria.
In the first blast in the town of Potiskum, a man ran onto a bus and detonated the explosive, killing himself and 16 others and destroying the bus.
Two bombers then targeted a major bus station in the Nigeria's main northern city, Kano, in a coordinated attack which left at least 10 dead.
Nobody has yet claimed responsibility for the attacks, but officials believe they may be a sign of revenge from Islamist militant group Boko Haram following a strong of successful assaults from neighbouring countries.
At least 10 people died in a blast at a bus station in the northeast Nigerian city of Potiskum, a hospital source told Reuters.
Nigerian forces backed by air strikes have killed more than 300 Boko Haram fighters during an operation to recapture 11 towns and villages since the start of the week, the military said today.
"Several weapons and equipment were also captured and some destroyed," defence spokesman Major-General Chris Olukolade said in a statement.
The news follows a number of recent attacks by Boko Haram militants on civilians in Nigeria's border regions.
Ten people have been killed and at least 30 more wounded after a female suicide bomber blew herself up at a crowded bus station in Nigeria.
A police spokesman for the city of Damaturu, in Yobe, said nobody had yet claimed responsibility for the attack - but it bears the hallmarks of Islamist militant group Boko Haram, which has increasingly been using female suicide bombers in recent months.
Witnesses said the woman detonated the bomb inside a Volkswagen, and video from the scene shows thick black smoke billowing from the car in the moments after the blast.
It comes after a controversial election was postponed until March 28 following security threats from Boko Haram towards voters.
Heavily armed Boko Haram militants attacked the northeastern Nigerian city of Gombe today, fleeing residents said.
Explosions and gunfire could be heard after the fighters overwhelmed a checkpoint at the edge of the city, which has been bombed before but has never had the insurgents attempt to take it over.
Niger's army fought back against militants from Islamist group Boko Haram who attacked in Gambaru on the Nigerian/Chad border, military sources said.
Eight Chadian soldiers were wounded in the attack while three Boko Haram vehicles were destroyed, the source told Reuters.
"We knew they were going to attack us. We were waiting. The battle didn't last long. They fled," the source said.
Nigerian opposition Presidential candidate Muhammadu Buhari has called for calm after the election was postponed due to security concerns.
Britain's Foreign Secretary Philip Hammond has expressed concern that security issues are being used to prevent the Nigerian people from exercising their democratic rights.
Foreign Secretary Philip Hammond has said Nigeria's decision to postpone the February 14 presidential election until March due to 'security concerns' is a "cause for concern".
Mr Hammond said the Nigerian people had a a "right to credible, peaceful and transparent elections" and that the security situation should not be used as a reason to deny them their democratic rights.
The decision by the Nigerian Electoral Commission to postpone the presidential elections is a cause for concern.
The Nigerian people have the right to credible, peaceful and transparent elections. There should be no further delay in delivering democracy and I urge all to remain calm during this period of frustration.
While we support Nigeria in its struggle against terrorism, the security situation should not be used as a reason to deny the Nigerian people from exercising their democratic rights. It is vital that the elections are kept on track and held as soon as possible in accordance with international norms
Niger's army repelled an attack by Nigerian Islamist group Boko Haram on the border town of Diffa today, but fierce fighting raged at a nearby bridge that crosses over into Nigieria, military sources said.
A local resident said a bomb had exploded in Diffa's central market, but most locals had already left the streets because of the fighting, which began overnight. A death toll was not immediately available.