Nigeria schoolgirl kidnappings: Will Boko Haram's plan backfire?

The opening of the World Economic Forum in Abuja, Nigeria, has been overshadowed by the abduction of more than 200 schoolgirls by the Islamist militant group Boko Haram.

Their kidnapping three weeks ago has caused outrage worldwide, sparking a global campaign calling for their safe return.

The leader of Boko Haram released a video on Monday, threatening to "sell" the students, saying they should not have been in school in the first place, but rather should get married.

John Simpson says the Islamist militants' publicity coup is "likely to backfire."