Boko haram baga
In its latest killing spree Boko haram killed at least 2,000 civilians in the town of Baga YouTube screenshot

Nigerian Islamist militant group Boko Haram killed a woman during labour in their most deadly attack in their six-year insurgency, a rights group has claimed.

According to Amnesty International, a witness has claimed that the militant group shot and killed the woman with indiscriminate fire during their assault on the town of Baga.

The northeastern Nigerian town, on the shores of Lake Chad, endured an assault which local officials have claimed took the lives of up to 2,000 people.

"Half of the baby boy (was) out and she died like this," an unnamed witness was quoted as saying to Amnesty International.

Amid conflicting death tolls, Amnesty have claimed that at least hundreds of people have died in the Baga attack launched by the group on 3 January.

"They killed so many people. I saw maybe around 100 killed at that time in Baga. I ran to the bush. As we were running, they were shooting and killing," a man speaking on condition of anonymity told Amnesty.

Another woman told the group: "I don't know how many but there were bodies everywhere we looked."

According to the Council on Foreign Relations, the terror group killed over 10,000 people in 2014 as they continued to wage their insurgency against Nigerian authorities.

The terror group continue to carry out attacks in the country's majority-Muslim northern regions in their quest to establish an Islamic caliphate in similar fashion to that of the Islamic State [IS] in Iraq and Syria.