Authorities in Kenya have arrested a senior police officer responsible for the cell where a blogger died, leading to widespread protests in the capital, Nairobi, that left dozens injured.

Outrage over the death of a Kenyan blogger in police custody sparked protests in the capital Nairobi this week after doctors refuted a police claim that the activist died in his cell from a self-inflicted head injury.

NAIROBI (Reuters) -Kenyan President William Ruto said on Wednesday the death of a blogger in custody occurred "at the hands of the police", though he cautioned against premature judgements and called for patience with the investigation.