The Nigerian military has conducted at least 10,000 secret and often forced abortions on women who were suspected of being impregnated by Boko Haram militants since 2013 as the nation looked to crack down on the insurgency group, an investigation by Reuters said Wednesday. 

After speaking with victims, health care workers and military members, the report detailed a clandestine abortion program was launched because senior officials reportedly believed infants born to insurgent fathers were "predestined" to "one day take up arms against the Nigerian government."

One civilian health care worker described the program as "sanitizing the society" as women, largely without their consent, were given pills and injections to force abortions after being kidnaped and often raped by members of Boko Haram.

Chibok school girls recently freed from Boko Haram captivity are seen in Abuja, Nigeria, Sunday, May 7, 2017. The 82 freed Chibok schoolgirls arrived in Nigeria's capital on Sunday to meet President Muhammadu Buhari as anxious families awaited an official list of names and looked forward to reuniting three years after the mass abduction. (AP Photo/ Olamikan Gbemiga)

Chibok schoolgirls freed from Boko Haram captivity are seen in Abuja, Nigeria, May 7, 2017. (AP Photo/ Olamikan Gbemiga)

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Four soldiers described for the publication how they were told by their superiors that the abortions were necessary to "destroy insurgent fighters before they could be born."

Soldiers detailed how women would either be separated in the field following rescue operations or later taken in groups to military facilities or civilian hospitals to undergo a required abortion.

Some women who resisted the military’s efforts after learning about the abortion program were forced to endure the procedure by being beaten, caned, tied down, held at gunpoint or drugged into submission, the investigation found.

One 24-year-old woman described being clubbed and insulted while being given medication to force an abortion at a military facility in northeast Nigeria in 2018.

"One of the soldiers beat me, saying that it’s a ‘bastard child’ from ‘a Boko Haram pregnancy,’" she said during the investigation. "He hit me with a gun."

Four health care workers told Reuters reporters that the scheme was for the good of the women and unborn children whom they argued would face stigma for being associated with Boko Haram.

FILE - In his file image taken from video released late Friday evening, Oct. 31, 2014, by Boko Haram, Abubakar Shekau, centre, the leader of Nigeria's Islamic extremist speaks in an unidentified place. Boko Haram leader Abubakar Shekau is believed to be fatally wounded in an airstrike while he was praying in a forest stronghold in northeast Nigeria, the military said Tuesday Aug. 23, 2016 A statement does not say how the military got the information but it identifies other commanders as "confirmed dead."(AP Photo/Boko Haram,File)

FILE - Boko Haram militants (AP)

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A number of women described being completely taken unaware by what was being done to them and were told they were being given medication to improve their health after living in captivity – in some instances for more than a year.

Multiple women said they realized what was happening after they began to experience sharp pains in their abdomen accompanied by bleeding.

Some of the abortions proved fatal, including for a woman who was believed to be six to seven months pregnant when she was given an injection.

"She was crying, yelling, rolling around, and at long last she stopped rolling and shouting. She became so weak and traumatized, and then she stopped breathing," said one woman who went by the name Ibrahim.

"They just dug a hole, and they put sand over it and buried her," she added.

Ibrahim’s account was reportedly corroborated by a companion of hers with whom Reuters also spoke.

Four soldiers and two security officers also told the publication that they had either witnessed women die during the procedures or later discovered their corpses.

FILE - In this file photo taken Wednesday, April 8, 2015, Nigerian soldiers man a checkpoint in Gwoza, Nigeria, a town newly liberated from Boko Haram. Nigeria's military says troops freed 338 captives, mainly children and women, in raids on Boko Haram camps in northeast Nigeria. Nigeria's Defense Headquarters says 30 militants of the Islamic extremist group were killed on Tuesday Oct. 27, 2015 in attacks on the fringes of the Sambisa Forest. (AP Photo/Lekan Oyekanmi, File)

FILE - Nigerian soldiers man a checkpoint in Gwoza, Nigeria, a town liberated from Boko Haram, April 8, 2015. (The Associated Press)

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The investigation was unable to confirm how many women died under the program since 2013 or who even was behind the clandestine scheme.

Nigerian military officials denied the existence of the program when questioned by Reuters, though the publication said it reviewed hospital records, military lists detailing abortion procedures and spoke with numerous eyewitnesses.

The report noted that Reuters believes the estimated 10,000 abortions since 2013 to be an undercount, based on documents it obtained and conversations with eyewitnesses.

Boko Haram has existed in various forms in northeastern Nigeria since the late 1990s.

Fighting between the government and the insurgent group escalated roughly a decade later as the group began to more aggressively target Christians and civilians.

FILE - In this Monday April 21, 2014 file photo, four female students of the government secondary school Chibok, who were abducted by gunmen and reunited with their families, walk in Chibok, Nigeria. A civil society group says Wednesday April 30, 2014, that villagers are reporting that scores of girls and young women who were recently kidnapped from a school in Nigeria are being forced to marry Islamic extremists. A federal senator for the area in northeast Nigeria wants the government to get international help to rescue the more than 200 missing girls kidnapped by Boko Haram from a school two weeks ago. (AP Photo/ Haruna Umar, File)

FILE - These girls escaped from Boko Haram. (AP)

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By 2014, Boko Haram had garnered international attention following the abduction of 276 schoolgirls from the northeastern town of Chibok.

Dozens of the abducted victims remain unaccounted for and several mass abductions have since occurred.