The Rwanda-backed rebel group M23 has denied involvement in a series of massacres in eastern Congo which were detailed in a report published by a rights group Wednesday. Lawrence Kanyuka, spokesperson for the M23 military,

M23, a rebel group backed by Rwanda, killed at least 140 people in July in the Democratic Republic of Congo, Human Rights Watch said. Most victims are Hutu.

Despite a peace process, attacks were carried out in more than a dozen villages last month, Human Rights Watch says.