Police said they are investigating the incident and intend to seek more information on him from the prison authorities.
He was later moved to Central Police Station ahead of planned arraignment.
Police authorities say they continue to face protests at various levels over the dropped Finance Bill 2024, those killed and those detained.
More than 42 people were killed in the protests while dozens of others were arrested.
More than 400 were injured in the protests and are nursing wounds in various facilities.
Several government agencies are investigating several issues emanating from the protests.
They include shooting dead of the protesters, looting, arson and robberies among others.
The protests forced President William Ruto to decline to sign the bill.
He has since launched a national dialogue to discuss the issues raised by the protesters amid resistance.
Discontent over the already high cost of living spiralled into nationwide protests, sparked by proposed tax hikes in the annual finance bill, which was however rejected.
Protest organisers called for the police to be held accountable for the shooting incidents.
Slain Ugandan athlete Rebecca Cheptengei accorded military burial