French children kidnapped in Cameroon 'shown in video' 25 February 2013 Last updated at 18:57 A video published on YouTube appears to show seven members of a French family, including four children, abducted by Islamists in Cameroon. The video shows an armed man reading a statement in front of two men, a woman and four children. Claiming to be from the Nigerian militant group Boko Haram, the alleged kidnappers demand the release of prisoners in Cameroon and Nigeria. The family were snatched last Tuesday by gunmen on motorbikes. Following the abduction, the French government said it believed the couple, their children aged five, eight, 10 and 12, and an uncle were taken across the border into Nigeria, probably by Boko Haram. The family live in the Cameroonian capital, Yaounde, where the father worked for the French gas group Suez. They had been returning from a visit to Waza National Park when they were kidnapped. Terribly shocking On Thursday, France confirmed it had "received information that the group Boko Haram is claiming to be holding the French family." "These images are terribly shocking and display cruelty without limits," French Foreign Minister Laurent Fabius said in a statement. In the video, one of the male hostages said they had been kidnapped by Jamaatu Ahlis Sunna Liddaawati wal-Jihad - the Arabic name for Boko Haram. One of the alleged kidnappers warned that France had launched a war on Islam. Behind him, the alleged family is shown flanked by two armed men in camouflage uniforms. A source close to the family confirmed their identities to the AFP news agency. France's foreign ministry said it was still trying to verify the authenticity of the video. Last week, a French minister wrongly confirmed reports that the family had been found and released in Nigeria. Meanwhile, French nationals have been urged to leave northern Cameroon "as quickly as possible." Another Islamist group - Ansaru - is also active in the region. Last Sunday, Ansaru claimed the abduction of seven foreign workers in Nigeria.