Seven other bodies have been retrieves from River Yala in western Kenya near the spot where a dozen others have been discovered over the last two years.
The unclaimed bodies we are retrieved from the river in the last two months, according to a police report seen by officials at Yala subcounty mortuary.
The bodies have not been comfirmed as they await autopsy.
Mortuary officials say three bodies were retrieved by divers in September and the other 4 were discovered by peoples along the river.
The latest discovery increases the tally of bodies retrieved from the river to more than 30 since January.
Human rights activists say residents in the area are living in fear over the discovery of un-comfirmed bodies from the river.
Police are yet to comment on the issue.
Details of forensic investigations conducted early this year seeking to uncover who was responsible and the motive behind the killings are yet to be made public.
There has been a concern over incidents of bodies being dumped in Kenyan rivers.
A year ago, 11 bodies were discovered in a river in the northeastern county of Garissa.