Nigeria abductions: Kerry says US experts set to start work

US Secretary of State John Kerry says a specialist team is set to start work in Nigeria to help find more than 200 schoolgirls abducted by militants.

He said the US team, working with the Nigerian government, would do everything possible to free the girls.

Earlier, Nigerian President Goodluck Jonathan said he hoped "a turning point" had been reached in the fight against Islamist insurgents Boko Haram.

Nigeria has been criticised for its slow response to the kidnappings.

Gordon Corera reports.