Terrorist group Boko Haram killed at least 60 people in the northeastern town of Rann on Monday in a renewed attack.
Al Jazeera quoted Amnesty International Nigeria director Osai Ojigho as saying, "This attack on civilians who have already been displaced by the bloody conflict may amount to possible war crimes, and those responsible must be brought to justice."
He further said that the witnesses stated that the Nigerian soldiers had abandoned their posts the day before the attack, demonstrating the authorities' failure to protect the unarmed citizens.
According to Al Jazeera, this was one of the bloodiest attacks in Boko Haram's decade-long conflict. This came two weeks after the militant group had overrun the same town, driving out Nigerian soldiers and marking its re-emergence.
Last year, the Nigerian Army had inflicted heavy casualties on Boko Haram when they had attacked the Garshigar community of Mobar Local Government Area in Borno.
Boko Haram is an Islamist militant group operating in the western and central African region, which has pledged allegiance to the Islamic State terrorist group.
The group is known to oppose western civilisation model of education and seek the introduction of sharia law in Nigeria.
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