Media playback is unsupported on your device Media caption In the video, released by Boko Haram, its leader says the girls will be freed only if imprisoned militants are released 
 
 Nigeria has insisted it will not agree to a request to free imprisoned Islamic militants in return for the release of dozens of kidnapped schoolgirls. 
 
 Interior Minister Abba Moro said Boko Haram, the group holding the girls, was in no moral position to make the offer. 
 
 However, the information ministry had earlier said all options were on the table, after the group released a video of the girls and suggested a swap. 
 
 Boko Haram snatched more than 200 girls from a school on 14 April. 
 
 About 50 children escaped, and it is not known how many are still being held. 
 
 Boko Haram Image copyright AFP Image caption The government has vowed to defeat Boko Haram Founded in 2002, name means "Western education is forbidden" in the Hausa language 
 
 Launched violent struggle in 2009, ostensibly to create Islamic state 
 
 Thousands killed, three million affected, mostly in north-east 
 
 Declared terrorist group by US in 2013 Profile: Abubakar Shekau Who are Boko Haram? Abduction timeline 
 
 The video released on Monday showed 136 girls, and was interspersed with militants explaining that they had "converted" to Islam. 
 
 Three of the girls - wearing full-length cloaks - are shown speaking. Two say they were Christian and have converted, while the other says she is Muslim. 
 
 The US state department said intelligence experts were closely examining the footage for clues to the girls' whereabouts. 
 
 Boko Haram leader Abubakar Shekau said on the video: "For those who have not accepted Islam, I swear to Allah we will never release them until after you release our brethren in your prison." 
 
 A man who is related to three of the girls said the video at first gave him hope, but then made him anxious and tearful. 
 
 "Maybe they are converted into another religion by force, so it truly is a kind of terrifying situation," said the man, who did not want to be named. 
 
 Earlier reports said some of the girls had been married off to their captors, and Abubakar Shekau had also threatened to sell some of them. 
 
 Media playback is unsupported on your device Media caption Nigerian Interior Minister Abba Moro says a prisoner swap is "not on the table" 
 
 After the video was released, an information ministry statement said the government would "continue to explore all options for the release and safe return of our girls". 
 
 However, Mr Moro later told the BBC that the government would not agree to any kind of exchange. 
 
 "As far as this government is concerned, the option of [the] swap of innocent citizens with people who have taken arms against the country... is not on the table," he said. 
 
 Media playback is unsupported on your device Media caption The BBC's John Simpson: "This whole part of Nigeria is Boko Haram territory" 
 
 Boko Haram, which means "Western education is forbidden", had previously said the girls should not have been at school and should get married instead. 
 
 The militants have been engaged in a violent campaign against the Nigerian government since 2009. 
 
 Image copyright Reuters Image caption Nigerians have joined together to pray for the girls 
 
 Image copyright AP Image caption The children's plight has sparked a global campaign 
 
 Image copyright AFP Image caption The video shows 136 girls, three of whom speak to the camera 
 
 The government has faced heavy criticism of its response to the mass abduction. 
 
 President Goodluck Jonathan said on Sunday that assistance from abroad had made him optimistic of finding the girls. 
 
 The UK and US already have teams helping on the ground in Nigeria and an Israeli counter-terrorism team is also on its way to the country. ||||| Demonstrators hold up banners during a rally that was held to mark the 120th day since the abduction of two hundred school girls by the Boko Haram, in Abuja August 12, 2014. 
 
 ABUJA One of more than 200 schoolgirls abducted by Islamist Boko Haram rebels in the northeastern Nigerian village of Chibok was freed this week, police and a parent of some of the other missing girls said on Thursday. 
 
 Boko Haram militants took the girls from a secondary school in the village near the Cameroon border in April, sparking a worldwide outcry, and have remained in captivity ever since. 
 
 Nigerian President Goodluck Jonathan has been pilloried at home and abroad for his slow response to the kidnapping and for his inability to quell the violence by the Islamist militants, seen as the biggest security threat to Africa's top economy. 
 
 "She was found running in a village. She was in the bush for about four days. She's still receiving medical attention," said a parent, who has two girls still with the insurgents and who declined to be named. 
 
 He added that she was now in the northeastern city of Yola. 
 
 Police spokesman Emmanuel Ojukwu told reporters in Abuja that the 20-year-old woman was discovered on Wednesday, saying she had been "dropped off by suspected Boko Haram militants" at Mubi in Adamawa state, some 100 km (60 miles) from Chibok. 
 
 "Her condition is stable," he said, without explaining why she might have been released. 
 
 The Islamists offered last May a prisoner swap to release the girls, but the proposal was rejected by the government. 
 
 A military operation in the northeast has so far failed to quell the rebellion and has triggered reprisal attacks that are increasingly targeting civilians, after they formed vigilante groups to try to help the government flush out the militants. 
 
 Boko Haram militants on motorcycles killed at least 18 people in an attack on the northeast Nigerian town of Shaffa late on Wednesday, witnesses said on Thursday. 
 
 The attack late on Wednesday left bodies in the street, witness Amos Mshelia, who escaped by running into the surrounding bush and on to the nearby town of Biu, told Reuters by telephone. 
 
 "People ran out of their houses in fear, but unknown to many of us the insurgents were nearby and they were pursuing people, shooting as we were fleeing," he said. 
 
 Boko Haram has seized several towns in the last two months, although the military said on Wednesday it had pushed them back and that 135 fighters had surrendered this week. 
 
 It also said Nigerian troops had killed a man posing as Boko Haram leader Abubakar Shekau in several videos, including one in which he threatened to sell the girls into slavery. The military said last year that Shekau himself might have been killed. 
 
 Boko Haram gunmen carried away some 270 girls and women, aged from 13 to over 20, when they raided the Chibok school. More than 50 eventually escaped, but at least 200 remain in captivity, as do scores of other girls kidnapped previously. 
 
 (Reporting by Tim Cocks; Additional reporting by Lanre Ola in Maiduguri; Editing by Louise Ireland and Crispian Balmer) ||||| Story highlights Nigerians stage a daily protest urging a better government response 
 
 Nigerian President vows "to get these girls out" 
 
 First lady Michelle Obama made her first solo White House weekly address 
 
 Key Muslim leader criticizes Boko Haram 
 
 Nigerians staging a daily protest in the capital said Saturday they are fed up with their government's indifference to the abduction of nearly 300 schoolgirls, even as the Nigerian president once again promised to bring them home. 
 
 For 11 days, the protesters in Abuja have demanded Nigeria do more to rescue the girls, who were kidnapped more than three weeks ago by the Islamist terrorist group Boko Haram. They vow to sit every day until the girls are rescued. 
 
 "We need to keep this up every day," protest organizer Rotimi Olawale told CNN. "We are saying that we want our girls alive." 
 
 Saturday, President Goodluck Jonathan said he was worried about the girls and he thanked other countries, including the United States, that have pledged support in finding them. 
 
 "We promise the world that we must get these girls out," Jonathan said. 
 
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 U.S. support for Nigeria 
 
 U.S. first lady Michelle Obama on Saturday condemned the "unconscionable" kidnapping of the girls, saying in the White House weekly radio address it was the work of "a terrorist group determined to keep these girls from getting an education." 
 
 Earlier this week, Obama tweeted a photo of herself with a sign that said #BringBackOurGirls. 
 
 U.S. and British officials are in Abuja to help Nigeria's government look for the girls, plan rescue missions and advise on ways to subdue Boko Haram. 
 
 President Barack Obama has directed his administration to do everything possible to help the Nigerian government, the first lady said. 
 
 'Nothing has been done' 
 
 Scrutiny of the Nigerian government's response to the kidnappings has escalated. A report Friday from Amnesty International says authorities knew at least four hours before the attack that Boko Haram was on its way to raid the girls' boarding school in the northeastern town of Chibok. 
 
 The report's findings echo accounts of a number of the girls' parents and villagers, who have described to CNN an ineffective military response in the days and weeks after the girls were taken. 
 
 "Nothing on the ground. Nothing," a Nigerian father told CNN. "(For) 21 days, nothing has been done." 
 
 A young mother from Chibok said all that families have left is hope. 
 
 "If 23 years ago somebody had abducted me, taken me away and killed my dreams, where would I be today? I might be dead," Aisha Yesufu said. "And for those kids, for nobody to care?" 
 
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 Boko Haram's leader, Abubakar Shekau, took credit for the mass kidnappings in a video that surfaced this week. He said he planned to sell the girls into slavery. 
 
 In a published interview Friday with Al-Hayat, a semiofficial Saudi newspaper, Saudi Grand Mufti Abdulaziz Bin Abdullah Al-Sheikh, a key religious leader in the Muslim world, condemned Boko Haram as a terrorist organization. 
 
 He described it as an organization "set up to smear the image of Islam" and said the group is "not right and misguided, because Islam is against kidnapping, murder and aggression." 
 
 Not enough troops to respond? 
 
 The Amnesty International report alleges that after Nigerian commanders were informed of the pending attack, they were unable to raise enough troops to respond. 
 
 A military contingent of between 15 and 17 soldiers and a handful of police officers in Chibok were unable to fend off as many as 200 Boko Haram fighters who stole the girls from their beds, the report says. 
 
 The Nigerian government claims it responded with troops, helicopters and airplanes in the immediate aftermath of the mass abduction. 
 
 "It is a very painful period for all of us," Nigerian Defense Minister Musiliu Olatunde Obanikoro said. "We've had sleepless nights trying to bring this to an end. Right now our primary concern is how that can be achieved and not disclose the details of where they are and whether they are in units or they are in one central location." Nigerian officials have frequently been criticized for failing to prevent Boko Haram's deadly attacks, particularly in the terror group's stronghold of northeastern Nigeria. 
 
 Michelle Obama's message on Twitter 
 
 At least 2,000 people have died in violence in northern Nigeria this year alone, Amnesty said. The most recent Boko Haram attack killed at least 310 people in a town that had been used as a staging ground for troops searching for the missing girls. 
 
 CNN EXCLUSIVE: Nigerian girl who escaped Boko Haram says she still feels afraid 
 
 READ: Boko Haram leader claims captives converted to Islam 
 
 READ: Playing dead allowed man to survive Boko Haram massacre
– The Wall Street Journal has a report raising hopes about the 200 or so Nigerian girls still missing after being kidnapped by Boko Haram. US surveillance planes have on at least two occasions spotted sizable groups of girls in remote locales in northeastern Nigeria. The girls had been moved by the time subsequent flights flew overhead, but the development suggests that instead of selling the girls into sex slavery as feared, Boko Haram is keeping them in the hopes of a prisoner swap with the government. In fact, the Journal quotes a Nigerian security adviser who says that Boko Haram leader Abubakar Shekau has given orders that "anybody found touching any of the girls should be killed immediately." President Goodluck Jonathan has publicly ruled out a prisoner exchange, but he is up for re-election in February and under heavy pressure to bring the girls home. Meanwhile, a human rights group has launched a campaign to provide educations for the girls who managed to escape, reports the Catholic News Agency.