Speaking on behalf of a coalition of African civil society groups, Gituku presented these shocking claims during a press conference addressing the violent aftermath of Tanzania's disputed October 29 election.
The alleged directive to medical staff is part of a wider pattern of extreme measures, which the activists are labelling as crimes against humanity.
Ndungi Gituku also released a new, grim death toll, stating that at least 3,000 Tanzanians have been killed by security forces since the protests began, with thousands more still missing.
The activist detailed a horrifying campaign to hide the scale of the violence, alleging that the government has been digging mass graves in numerous towns, including Mwanza, Arusha, and Dar es Salaam, to secretly bury the dead.
He added that a worker involved in the burials had stated he had never witnessed so many corpses in his entire life.
The Tanzanian government is further accused of using foreign security agents to help enforce a cover-up.
Gituku alleged that a combined force of local police and these foreign personnel are heavily guarding hospitals and mortuaries.
Their purpose, he claimed, is to intimidate medical staff and families, and to confiscate mobile phones to delete any photographic or video evidence of the killings.
In another shocking claim, the activist stated that an incinerator is being operated in the Pwani region, specifically to burn bodies and destroy all traces of the alleged massacre.
President Samia Suluhu Hassan's administration is now facing intense pressure following these allegations, which come shortly after her private swearing-in ceremony.
The human rights coalition also reported that hundreds of relatives have been arrested simply for trying to inquire about their missing family members at police stations.
Citing the alleged "maliza" order, the mass graves, and the use of an incinerator, the group is now urgently calling for an international investigation into what they describe as a "state-engineered massacre" and war crimes.
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