in a case that has reignited anger over police abuse and triggered street protests in Nairobi. Police spokesperson Michael Muchiri said on Friday that a constable had been taken into custody, the AFP news agency reported.

He did not give further information, referring queries to the Independent Policing Oversight Authority (IPOA), which is leading the investigation. There was no immediate comment from the IPOA. Ojwang, 31, was declared dead last Sunday, two days after his arrest in the town of Homa Bay in western Kenya for allegedly criticising the country’s deputy police chief Eliud Lagat.

The police initially claimed Ojwang fatally injured himself by banging his head against a cell wall, but an autopsy revealed injuries that pathologists said were “unlikely to be self-inflicted”. The government’s own pathologist found signs of blunt force trauma, neck compression and soft tissue injuries, suggesting an assault. Independent pathologist Bernard Midia, who assisted with the post-mortem, also ruled out suicide.

Amid growing pressure, President William Ruto said last Wednesday that Ojwang had died “at the hands of the police”, reversing earlier official accounts of his death. The incident has added fuel to longstanding allegations of police brutality and extrajudicial killings in Kenya, particularly following last year’s antigovernment demonstrations. Rights groups say dozens were unlawfully detained after the protests, with some still unaccounted for.

Earlier this week, five officers were suspended to allow for what the police described as a “transparent” inquiry.

Last Thursday, protesters flooded the streets of the capital, waving Kenyan flags and chanting “Lagat must go”, demanding the resignation of the senior police official Ojwang had criticised. Ruto pledged swift action on Friday and said that his administration would “protect citizens from rogue police officers”. While Ruto has repeatedly promised to end enforced disappearances and extrajudicial killings, human rights groups accuse his government of shielding security agencies from accountability.

According to IPOA, 20 people have died in police custody in just the past four months. The death of Ojwang, a vocal online critic, has become a symbol of growing public frustration with unchecked police power. (Al Jazeera/AFP)