Western embassies in Tanzania, including the UK and France, have called on the authorities to release all bodies of those killed in the October electoral violence to their families.
Citing "credible reports", the 17 missions said there was "evidence of extrajudicial killings, disappearances, arbitrary arrests" and the "concealment of bodies" by Tanzanian authorities during the unrest.
Tanzania has not commented but the statement comes just days after President Samia Suluhu Hassan angrily hit out Western nations, accusing them of interfering in the country's internal affairs.
Hundreds are reported to have been killed in the violence, though the government has not released an official toll.
The authorities violently cracked down on widespread demonstrations after the 29 October presidential election, in which President Samia was declared the winner with nearly 98% of the vote.
