Residents from five villages say people too elderly to flee Gwoza local government area are being rounded up and taken to two schools where the militants open fire on them. The villages are about 130 kilometres southeast of Maiduguri, the Borno state capital.
"What they are doing now is to assemble the aged people, both men and women ... And then they just open fire on some of them," said Muhammed Gava, a spokesman for civil defence groups in the area. More than 50 people had been killed at Government Day Secondary School in Gwoza, he said.
Government officials did not immediately comment on the reports.
Nigeria's military said soldiers are patrolling "in search of terrorists" and "to verify abductions" yesterday around the village of Gumburi, where witnesses say extremists kidnapped at least 185 people a week ago.
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Extremists have killed thousands of people in a 5-year uprising that has driven some 1.6 million from their homes.