An intelligence source who is monitoring the situation tells VOA that military forces are getting closer to the town and the militants may be preparing to defend Gwoza, which is one of the last major towns they control in northeastern Nigeria.
The source says Boko Haram reinforcements are traveling to Gwoza from their refuge in the nearby Sambisa forest.
Gwoza is located about 135 kilometers south of the Borno state capital, Maiduguri.
The Associated Press reports the militants are surrounding the town with land mines and warning civilians to flee. It says the fighters have released some young women they had been holding.
VOA’s source says earlier this week, militants in Gwoza killed some civilians who refused to take up arms with Boko Haram to defend the town.