Sumonu told newsmen in Yobe that three males were later abducted by the insurgents in a remote community in Geidam Local Government Area after the attack on Dapchi.
"They ran away I saw them with my naked eyes", the source said, adding that the militants are still armed.
Reports say the girls and teachers of the Government Girls Secondary School (GGSS) in the town managed to escape unhurt in the attack.
He said the insurgents carted away foodstuffs from the schools and gallons of petrol belonging to fuel hawkers (black marketers) as they drove off from Dapchi, on Monday night.
There are rumors that the insurgents may have abducted some schoolgirls but authorities are yet to confirm this.
Aishatu, who spoke in Hausa said: "My name is Aishatu Abdullahi".
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The insurgents invaded the school Monday night at about 7pm. They were shooting guns and everyone was confused; then we started running helter skelter but they were able to.
"There were no soldiers at the time of the invasion". We are yet to know if there are casualties because, everyone in the town has scampered for safety.
"We have been hearing many numbers, between 67 and 94". According to the accounts of some of my mates, the Boko Haram told those that were caught in the mosque to sit on the floor, including our teachers.
"We can not say [if they have been abducted], because the insurgents went into the students hostel, and many of these students scaled the fence and escaped into the bushes".
The father of one 16-year-old girl told the AFP news agency: " We still don't know how many of our daughters were recovered and how many are still missing.
"The school has given us one week to go home for a break; but in all honesty, I am not willing to come back here because we are scared of what could happen to us in the future".