An autopsy shows that 16-year-old Muhammad Hussein Abu Khdeir, the boy who Palestinians believe was killed by Israeli extremists in revenge for the kidnapping and deaths of three Israeli teens, was burned to death.

According to the Associated Press, Palestinian Attorney General Abdelghani al-Owaiwi said that Abu Khdeir, whose body was found in a forest hours after his death, suffered burns on "90 percent of his body." He continued, "The results show he was breathing while on fire and died from burns and their consequences."

Though Palestinians immediately believed that Israeli extremists were behind his murder, Israeli police said that they have not yet determined who killed Abu Khdeir or why they did it, according to the AP. An investigation is underway.

[image via AP]