U.N. warns Nigeria's Boko Haram over selling schoolgirls as slaves

People take part in a protest demanding the release of abducted secondary school girls from the remote village of Chibok, in Lagos May 5, 2014. REUTERS/Akintunde Akinleye

GENEVA (Reuters) - The United Nations warned Islamist Boko Haram militants on Tuesday that there was no statute of limitations if they carried out their leader's threat to sell more than 200 Nigerian schoolgirls kidnapped last month.

Boko Haram leader Abubakar Shekau said in a video released on Monday that Allah (God) had told him to sell the girls taken by his fighters from a secondary school in the village of Chibok, in northeastern Borno state, on April 14.