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Islamist group Boko Haram militants seized a northeastern Nigerian town of Bama, killing scores of people and driving thousands of residents from their homes, Reuters reported.
Reports say at least 5,000 people fled when the Islamists overrun the town, 70 km from the norteastern Borno state capital of Maiduguri.
Adrian Edwards, spokesman for the UN refugees agency, said around 645,000 people are internally displaced in Nigeria because of the fighting.
Nigeria's health minister has said that the country has "thus far contained" the spread of Ebola within its borders.
There is only one person still being treated in isolation in Lagos, the minister said.
Suspected Boko Haram fighters have abducted dozens of boys and men in a raid on a remote village in northeast Nigeria, loading them onto trucks and driving them off, witnesses who fled the violence have said.
Several witnesses who arrived as refugees in the city of Maiduguri told Reuters news agency the militants had also killed six older men in last Sunday's raid on the village of Doron Baga, in which several houses were burned.
As many as 97 people are unaccounted for, the villagers said.
A nurse in Nigeria has died from the Ebola virus - the second death in Africa's most populous country, the Associated Press reports citing the Nigerian Health Minister.
A second case of Ebola has been recorded in Lagos. The Nigerian Health Minister said it was the doctor who treated US victim Patrick Sawyer.
Sawyer died in Lagos last month after arriving there by plane from Liberia.
Around 63 of the women and girls kidnapped by Islamist militants Boko Haram more than two months ago have managed to escape their captors and return home, according to a high-level security source cited by AFP.
Abbas Gava, a senior official of the local vigilantes in Borno State, said he had “received an alert from my colleagues ... that about 63 of the abducted women and girls had made it back home.”
The women are said to have fled when the militants holding them left to fight.
“They took the bold step when their abductors moved out to carry out an operation,” he added.
More than 60 women escape Islamist abductors in Nigeria, according to a security source cited by AFP.
BREAKING: More than 60 women, girls escape Islamist abductors in Nigeria: security source
Nigeria says it is "inching towards" the rescue of more than 200 school girls who were kidnapped by Islamist militants Boko Haram more than two months ago.
The government said that it had held a key commander who had been supplying information to the extremists, who have threatened to sell the girls into forced marriages or slavery.
Campaigners for the 'Bring Back Our Girls' group, which holds a daily rally in the Nigerian capital Abuja, said they would continue to campaign to free the girls until they are released unharmed.
Gordon Brown called on the international community to turn their offer of help to return over 200 schoolgirls kidnapped by Boko Haram 10 weeks ago into "practical measures".
The former PM said Nigerian authorities needed support with night-vision equipment, air cover and suggested some of the girls could be in neighbouring Niger, Cameroon or Chad.