A teacher who witnessed the aftermath of the bomb blast during morning assembly at a school in Potiskum, Nigeria, today said they are certain the death toll from the explosion will rise.
"As it stands now, we have taken about 20 dead bodies to the hospital. There are some that are critically injured and I am sure the death toll will rise," the teacher told Reuters.
A bomb has gone off during a school assembly in Northeast Nigeria this morning, killing at least 20.
The blast, at a school in the town of Potiskum, was confirmed by a local teacher, reports Reuters.
A man claiming to Boko Haram leader Abubakar Shekau said that more than 200 girls kidnapped by the group six months ago from northeast Nigeria had been "married off" to its fighters, contradicting government claims they would soon be freed, Agence France-Presse reports.
The militants usually give a copy of their videos to the French news agency a day before they get posted online. The latest one is likely to raise doubts about whether talks between a rebel faction and the government in neighbouring Chad will secure the girls' release.
Suspected Boko Haram militants have kidnapped 25 girls from a remote village in northeast Nigeria witnesses have claimed.
This is despite talks to free hostages already held by the group.
Nigeria has been declared officially free of Ebola after a 42-day period with no new cases, the World Health Organisation (WHO) has said.
The announcement eases fears that the disease could have spread to one of Africa's most densely-populated areas.
WHO Director General Dr Margaret Chan said on Sunday that the appearance of the virus in Lagos would have been "the worst nightmare scenario anyone could imagine".
She said the nation's innovative polio campaign, which uses satellite technologies to track population, had been re-purposed to aid the fight against Ebola.
Last week, the WHO announced that Senegal was Ebola-free, but the pace of the outbreak continues to quicken in the three worst-hit countries.
The residents of the home town of over 200 kidnapped Nigerian schoolgirls are a cautiously optimistic about a ceasefire with the Islamic extremists who kidnapped their daughters six months ago.
"We don't know how true it is until we prove it," Bana Lawan, chairman of the Chibok local government area, said.
"We will know the negotiations were successful when we see the girls physically. And then we will know it is true. And then we will celebrate."
Community leader Pogu Bitrus said "people rejoiced, but with caution" after the military announced the ceasefire with the Islamic extremist group Boko Haram on Friday.
"We are waiting, hoping that it is really true and that the people who negotiated on Boko Haram's side, that they are the genuine leaders."
However, Suspected Boko Haram militants have killed several people in two attacks on Nigerian villages that occurred after a government announcement of a ceasefire, security sources and witnesses said.
Suspected insurgents attacked the village of Abadam, killing at least one person and ransacking homes.
Another attack on the village of Dzur left at least eight people dead.
Nigeria's armed forces chief, Air Chief Marshal Alex Badeh, announced on Friday a deal with Boko Haram for a ceasefire.
Nigeria aims to have around 200 girls kidnapped by Islamist Boko Haram militants freed by Tuesday, according to a senior source at the presidency.
The source was speaking to Reuters news agency but he declined to comment on where the transfer would take place.
He said: "I can confirm that the federal government is working hard to meet its own part of the agreement so that the release of the abductees can by effected either on Monday or latest Tuesday next week."
Boko Haram could release 200 missing Nigeria schoolgirls within 'hours or days' after being abducted by the terror group six months ago.
Nigerian defence spokesman Major General Chris Olukolade said the deal was still being negotiated.
But French President Francois Hollande welcomed the "good news" and told a news conference in Paris the girls' release "could happen in the coming hours and days".
France has been involved in negotiations that led to the release of several of its citizens kidnapped by Boko Haram in Cameroon.
Boko Haram negotiators have assured that the schoolgirls and all other people in their captivity are all alive and well.
A senior Nigerian security source confirmed the existence of talks to Reuters, but said it remained unclear whether Abuja was negotiating with self-proclaimed Boko Haram leader Abubakar Shekau, or another faction within the group.
"Commitment among parts of Boko Haram and the military does appear to be genuine. It is worth taking seriously," the security source told Reuters.
Talks have failed before in part because the group has several different factions.
The government was negotiating with Danladi Ahmadu, a man calling himself the secretary-general of Boko Haram, the presidency source said. It was not clear if Ahmadu is part of the same faction as Shekau.