Kenya's police chief says three police officers will be arrested over the disappearance of three men, including a human rights activist with the U.S.-based International Justice Mission.

Joseph Boinnet spoke Friday as two bodies thought to be those of the missing men were retrieved from a river in central Kenya. A third slipped back into the river.

Human rights groups say rights lawyer Willie Kimani, his client Josphat Mwenda and taxi driver Joseph Muiruri were abducted on June 23 while coming from court, where Mwenda faces several charges.

Rights groups have said the charges, including narcotics possession, were trumped up by a policeman after he shot Mwenda without provocation in April 2015.

Mwenda had said he received threats after he reported the officer to the Independent Police Oversight Authority.