Heavily armed men burst into the home in the middle of night, hustling four brothers into separate rooms. Afghan special forces then shot them in the head and heart. The operation, the CIA-trained Afghan unit said, targeted the Islamic State group's militants in a remote region of eastern Nangarhar Province. In reality, the raid took place in the province's capital of Jalalabad. The truth of their deaths was eventually revealed by local and international media and the country's intelligence chief, Masoom Stanikzai, was forced to resign. But that's not enough, says Human Rights Watch in a new report released Thursday documenting what it says are mounting atrocities by U.S.-backed Afghan special forces and rising civilian deaths by both American and Afghan forces. It calls for an investigation into whether the U.S. has committed war crimes in Afghanistan. The report says U.S.-led peace talks to end the 18-year-old war have omitted addressing the future of the Afghan special forces that work "as part of the covert operations of the Central Intelligence Agency." The report suggests either disbanding them or bringing them under the control of the Defense Ministry. "These troops include Afghan strike forces who have been responsible for extrajudicial executions and enforced disappearances, indiscriminate airstrikes, attacks on medical facilities, and other violations of international humanitarian law, or the laws of war," it says.