A Kenyan activist has told the BBC that he is "struggling to be alive" after allegedly being sexually tortured in detention in Tanzania last month.
Boniface Mwangi said he had decided to speak despite the "shame and guilt of being sodomised with all manner of things".
Mwangi said he was held in Tanzania after going to the country to show solidarity with detained opposition politician Tundu Lissu.
At a press conference in Kenya's capital, Mwangi tearfully claimed that he was stripped naked, hung upside down, beaten on his feet and sexually assaulted while detained.
The police chief in Tanzania's main city of Dar es Salaam disputed Mwangi's account and told the BBC they were "opinions" and "hearsay" coming from activists.
"If they were here, I would engage them; I would ask them what are they saying, what do they mean... In law, those things are called hearsay or hearsay evidence," Jumanne Muliro told the BBC.
