A pregnant woman giving birth was one of around 2,500 people slaughtered by militants in Nigeria last week, in what is described as one of the country's deadliest attacks.
Thousands of people have fled the violence across the border to Chad and to other parts of Nigeria.
However witnesses have revealed that, as well as slaughtering civilians, the terrorists have rounded up 300 women and detained them at a school.
While the older women, mothers and children were released after four days, the younger women and teenagers have been kept.
One of the women released explained: "Boko Haram took around 300 women and kept us in a school in Baga.
"They released the older women, mothers and most of the children after four days but are still keeping the younger women."
It is horribly reminiscent of last year's reports, when Boko Haram fighters kidnapped 276 schoolgirls from a boarding school in north-east Chibok last year.
Dozens escaped, but 219 remain missing.
"They released the older women, mothers and most of the children after four days but are still keeping the younger women"
Amnesty, who released satellite images of the devastation, have said that eye-witness accounts and photos have reinforced the view that the attack was Boko Haram's "largest and most destructive" in its fight to establish a hardline Islamic state in northeast Nigeria.
"The deliberate killing of civilians and destruction of their property by Boko Haram are war crimes and crimes against humanity and must be duly investigated," it added.