Diplomats and intelligence officials say they believed at least some of the girls were being held in the forest about 60 miles from Chibok, although U.S. reconnaissance drones failed to find them.
Nigerian forces backed by warplanes invaded the vast former colonial game reserve late last week as part of a push to win back territory from the group.
The group, notorious for violence against civilians, controlled an area roughly the size of Belgium at the start of the year but has since been beaten back by Nigerian troops, backed by Chad, Niger and Cameroon.
Reuters
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