Salahuddin, Libya (CNN) -- It's a harrowing story -- even by the standards of blood-soaked Libya. 
 
 Muneer Masoud Own, 33, who made a living doing manual labor, said forces loyal to longtime Libyan leader Moammar Gadhafi slaughtered nearly 150 prisoners as rebels closed in on Tripoli last week. 
 
 Charred bodies littered the ground around a warehouse -- roughly 30 feet by 45 feet -- where the detainees were kept. A volunteer who helped remove them, Bashir Own, estimated that he had seen about 150 bodies. He is not related to Muneer Own, who said he barely escaped an ordeal that started about a month ago. 
 
 In early August, Muneer Own said, he and his 30-year-old brother were walking toward their grandfather's home when pro-Gadhafi forces detained them for reasons that were not explained. He said they were handcuffed, blindfolded and put into a warehouse with about 60 others who ranged in age from 17 to 70. 
 
 Over the next 18 days, Gadhafi's forces kept bringing detainees, Own said. Soon, about 175 people were crammed inside the warehouse, near the headquarters of the Libyan military's 32nd Brigade -- a much-feared unit led by one of Gadhafi's sons, Khamis. 
 
 Own said he endured horror and deprivation in the warehouse. 
 
 "I don't know how I survived those moments. They were abusing us and beating us," Own said. "All I was thinking of was going home. I was dreaming of freedom." 
 
 In the three days before he made his escape even as others around him were killed, the detainees had no food or water, Own said. The warehouse filled with the stench of human waste. 
 
 Then, suddenly, Own and the others found a reason to hope: Guards said they would soon release everyone. It was all they talked about for a day or so. 
 
 Just before sunset on the promised day of release, guards opened the warehouse doors, Own said, but the door did not lead to freedom. He said the guards tossed a grenade into the warehouse and started shooting. 
 
 Dozens fell dead. 
 
 Own ran for his life. He said about two dozen others managed to escape, but he lost track of his brother in the chaos. He has not heard from his brother since that day, he said, and assumes that he did not survive. 
 
 When rebels finally took over the base and residents felt safe enough to approach the warehouse, all they found were charred remains. Volunteers said they pulled out at least 150 bodies, the majority of them unrecognizable. 
 
 In another corner of the lot, piles of dug-up earth teemed with maggots. More bodies were found there. 
 
 People found a handful of papers that could help identify the victims, but no one is sure. Many of the victims may remain unknown, their families left without answers to their fate. ||||| Launch Gallery Expand Charred skeletal remains of what appears to be detainees executed by the Khamis Brigade. © 2011 Human Rights Watch 
 
 (Tripoli) – Members of the Khamis Brigade, a powerful Gaddafi military force run by Muammar Gaddafi’s son Khamis, appear to have summarily executed detainees in a warehouse near Tripoli on August 23, 2011, Human Rights Watch said today. Within three days the same warehouse was set on fire but the cause is unknown, Human Rights Watch said. 
 
 Human Rights Watch inspected the charred skeletal remains of approximately 45 bodies, still smoldering, on August 27. The remains were spread throughout a warehouse in the Khalida Ferjan neighborhood in Salahaddin, south of Tripoli, adjoining the Yarmouk Military Base. At least two additional corpses were seen lying outside, unburned. 
 
 “Sadly this is not the first gruesome report of what appears to be the summary execution of detainees in the final days of the Gaddafi government’s control of Tripoli,” said Sarah Leah Whitson, Middle East and North Africa director at Human Rights Watch. “These merciless murders took place in the midst of Ramadan and those responsible should be brought to justice and punished.” 
 
 Human Rights Watch interviewed a survivor who said that guards at the warehouse, used as a prison, read out 153 names of detainees in the roll call the day of the killings. He estimated that 20 escaped from the attack and said that around 125 of the 153 detainees were civilians. Human Rights Watch observed that one building in the compound had spray-painted on it “32nd Brigade,” which is the official name of the Khamis Brigades. 
 
 Human Rights Watch spoke with one man who said he survived the shooting and grenade attack. Human Rights Watch also spoke to three others: one man who said he was detained in the warehouse until about August 10, a neighbor who heard the shooting and grenade explosions on August 23, and a National Transitional Council (NTC) fighter who discovered the remains on August 26, when the NTC forces first entered the area. Both detainees said they were civilians accused of supporting the rebels, and that no charges had been brought against them. 
 
 The survivor, Abdulrahim Ibrahim Bashir, 25, said that at sunset on August 23 guards of the Khamis Brigade opened fire on him and the other detainees from the roof, shooting through the roof’s tin sheeting, while another guard threw grenades in from the entrance. He survived by escaping over a wall while the guards were reloading their weapons. 
 
 Abdulrahim and the man detained earlier at the warehouse, Moiayad Abu Ghraim, 28, who was interviewed separately by Human Rights Watch, said that the commander overseeing the warehouse was Muhammad Mansour of the Khamis Brigade. Neither of them had ever seen him. 
 
 Abdulrahim said that Khamis Brigade members had held him in the warehouse for three months. The forces that detained him in his hometown of Ghadamis accused him of being “one of the revolutionaries.” He escaped his detention in the warehouse unharmed together with Abdulsalam and Hussain, last name unknown, who were brothers from Zlitan. The brothers were wounded after the guards began firing on them. Hussain later died. 
 
 Abdulrahim told Human Rights Watch: 
 
 Four soldiers climbed on the top of the warehouse, and another soldier opened the door. They started shooting at us through the roof. It was made of sheet metal. The guy at the door was throwing in grenades…I saw bullets and heard people saying Allahu Akbar, and that’s all. I saw [eight people] fall down. When [the guards] were refilling their ammunition, I ran out the door and jumped over the wall. I was not wounded, hamdullah. They just shot and killed us… After I escaped, I saw one of the soldiers finish off anyone who was wounded lightly. He would just finish them off. I saw him from far away. He was wearing trouser fatigues and a civilian top. I recognized him. He was one of the ones guarding us. His name was Brahim and he was from Tajoura … After I escaped on August 23, I hid in a house outside the compound for three days, and saw that the guards were still there. Two other detainees were wounded with me. [The rebels] took Abdulsalam from Zlitan to the hospital [after they arrived three days later], but his brother Hussain died in my arms in the house. I left his body inside the house... The [warehouse] was already burning when the rebels came, but I didn’t see how it happened. I just saw it when the rebels came; it was already burnt, and black smoke was coming out. I left around sunset yesterday [August 26]. 
 
 
 
 On August 27, Human Rights Watch counted approximately 45 distinct human remains in the ashes of the warehouse as well as other unidentifiable burned matter. Human Rights Watch also observed what appeared to be bullet holes in the tin roof of the warehouse. Smoke was still rising in one or two parts of the warehouse during the visit. 
 
 Human Rights Watch also interviewed an NTC fighter who said that he and his brigade found the warehouse while it was smoking when they seized the Yarmouk military base in Salahaddin on August 26. He told Human Rights Watch that as his brigade entered the base around noon, they went looking around. “We smelled it,” he told Human Rights Watch about their discovery. 
 
 Human Rights Watch did not have sufficient evidence to establish who or what started the fire. 
 
 According to the former detainee Moiayad, who was transferred out of the warehouse on August 10 to another detention facility near Tripoli, between 60 and 80 people were held at any given time at the warehouse. The guards there gave them food only sporadically and limited their water to one liter a day, despite the high summer heat. He said there were no lavatories. He told Human Rights Watch: 
 
 
 
 At one point we stayed 36 hours without food or water. After that they gave us each a cucumber to last us the entire day, and then on other days they would bring us a bowl of pasta, which was often almost raw, but [there was only enough for] each of us to eat five spoonfuls. The food wouldn’t be fed to a dog. 
 
 
 
 The guards also held him for six days, along with half a dozen others, in the hold of a small truck in the yard, Moiayad said. 
 
 A local resident who lived near the warehouse and had medical training said he heard the shooting and explosions on August 23. Neighbors then approached him to assist with the wounded. The man, who did not want his name disclosed, said: 
 
 
 
 Last Wednesday, sometime after the early evening prayer, I heard the sound of heavy gunfire and grenades, then complete calm. Then in the evening, my neighbors came to me. They asked if I could help people with gunshot wounds…I told them to take them to the hospital. [The neighbors] were scared to take them to the hospital, so they kept them [at home]. 
 
 
 
 He told Human Rights Watch that Gaddafi forces had begun using the area outside of the Yarmouk military base since about early May. He said that the warehouse in which the detainees were held was previously an agricultural facility. 
 
 Under international humanitarian law, applicable during an armed conflict, violence to life and person, in particular murder of all kinds of civilians and persons not engaged in combat, such as detainees, is always strictly prohibited and constitutes a war crime. This is irrespective of whether the conflict is an international or non-international conflict. Murder can constitute a crime against humanity when committed as part of a widespread or systematic attack against a civilian population. Such an attack, meaning a state policy, could include a policy of executing detainees. 
 
 The two former detainees identified the names of the following detainees whom they believe were killed in the massacre: 
 
 
 
 Abdulrahim, Souk el-Juma 
 
 Muhammad, Zawiya 
 
 Ramadan Zreig, Zlitan 
 
 Tassir al-Tini, Ghadames, approximately 33 or 34 
 
 Baher al-Tini, Ghadames, approximately 33 or 34 
 
 Muhammad el-Lafi, Zawiya 
 
 Osama el-Lafi, Zawiya 
 
 Walid Sagar, Zawiya
– Troops loyal to Moammar Gadhafi massacred some 150 detainees last week, according to volunteers who cleared charred bodies from the warehouse that had apparently served as the detainees’ prison. An escaped prisoner told his story to CNN: He and his brother were handcuffed and blindfolded for no apparent reason while out walking earlier this month. They were thrown into the warehouse with 60 others ages 17 to 70. The number inside quickly reached 175 as loyalists continued to imprison people. The detainees were given no food or water for days, said Muneer Own. Finally, the troops said they would set them free—but instead hurled a grenade at them and opened fire. About 25 people were able to escape, Own said; his brother apparently was not one of them. The mass of bodies was discovered when rebels eventually took over the area. Many remain unidentified, part of a growing number of prisoners whose whereabouts remain unknown, notes the Washington Post. Thousands—some of whom have been jailed for decades—could be in underground prisons or mass graves, rebels fear. Click through for one family’s story.