Reports yesterday of decomposing bodies littering the streets of Damasak came as president Muhammadu Buhari denounced the Islamists as a bogus religious group and vowed a hard line against them when he comes to power at the end of next month.
Northeast Nigeria has been relentlessly targeted throughout the jihadists' six-year uprising but there had been a lull in violence in recent weeks.
A coalition of troops from Chad, Cameroon, Niger and Nigeria has claimed major victories since February, reportedly flushing the militants out of areas they previously controlled.