Ten Kenyan and international human rights groups say police are responsible for the disappearance of three men, including a human rights activist with the U.S.-based International Justice Mission.

The rights groups said Wednesday that evidence shows that human rights lawyer Willy Kimani, his client Josphat Mwenda and taxi driver Joseph Muiruri were abducted on June 23 while coming from court where Mwenda had been charged with possession of narcotics.

The rights group said that Mwenda, a motorcycle taxi driver, had been shot by a plainclothes police officer on April 10, 2015, without provocation. The rights groups said that in an attempt to cover up the shooting the officer charged Mwenda with drug possession. Mwenda said he received threats after he reported the officer to the Independent Police Oversight Authorities.