Intelligence sources believe they know where some of the schoolgirls kidnapped in Nigeria are, Sky News understands.
The sources believe they have been split into at least four different groups, complicating the search to find the girls almost four weeks after they were taken by militants from Boko Haram.
British and American officials are using advanced eavesdropping equipment to scan the Sembisa forest where the schoolgirls are thought to be, Sky News understands.
Sky's Special Correspondent Alex Crawford, who is in the Nigerian capital, Abuja, said if the intelligence is true it would be "much more difficult to mount simultaneous raids" to rescue them.
"The whole thing is fraught with danger," she added.
Original headline: Kidnapped Schoolgirls 'Split Into Four Groups'
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