Hamat, who calls himself a general, is accused of rallying citizens in the town of Gaga to help provide supplies for the attack on Camp Bangui, where predominantly Christian citizen militias known as anti-balakas were believed to be operating.
"In Gaga, Hamat requisitioned motorcycles from local transporters. He then requested fuel and 'donations' from the local Muslim population, asking an assembled crowd in Arabic: 'Are there no loyal Muslims here to donate fuel so we can fight the enemy?'" Human Rights Watch detailed in its report.
Hamat and his forces later made their way to Camp Bangui, located more than 15 miles (25 kilometers) away in an area only reachable by motorcycle. The death toll of the Nov. 10 attack has not been determined because of insecurity in the area, the rights group said.
Hamat acknowledged there was fighting between his forces and the civilian militia in Camp Bangui but said "maybe four homes were burned."
"My elements do not have the right to cause disorder. If they do, I will sanction them," he told Human Rights Watch. "I want peace. I want people to return to their homes."
The Seleka movement incorporated fighters from several existing armed groups and officially launched its rebellion in December 2012. In March thousands of rebels descended upon the capital and forced President Francois Bozize out after a decade in power. They quickly installed their leader Michel Djotodia as president, though months later the country remains in a state of near-anarchy.
The rebels are accused of carrying out scores of atrocities, including killing, torturing and raping civilians and forcibly conscripting child soldiers. Most of the attacks are taking place in isolated areas of Central African Republic where details only emerge after survivors make their way to safety. Much of the violence has focused around Bossangoa in the country's northwest, the home region of Bozize where rebels are accusing civilians of backing the ousted leader.
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Follow Krista Larson on Twitter at https://twitter.com/klarsonafrica.