They said they spoke to 23 different local leaders who said they saw the militants in the vicinity on the day of the attack.
The local leaders alerted the Nigerian army to the presence of a convoy of militants in a village called Gumsa, about 30km (18 miles) from Dapchi town.
That was early on Monday 19 February. Later that evening, militants attacked the school on at least nine vehicles, kidnapping 110 children. Continue reading