- The seven were among 14 rhinos that were moved from Nairobi and Lake Nakuru national parks two weeks ago.
- Tourism Minister Najib Balala yet to comment on the tragic outcome.
Seven black rhinos have died in unclear circumstances at the Tsavo East National Park.
Kenya Wildlife Service (KWS) has refused to comment on the rhinoceros deaths but, speaking on condition of anonymity, one official said, "Seven of the rhinos died but it has not been established as to why."
The seven were among 14 rhinos that were moved from Nairobi and Lake Nakuru national parks two weeks ago.
The programme was conducted jointly between KWS and the World Wide Fund (WWF).
“Translocating wild animals of this size is extremely challenging and not without risk, but black rhinos are under enormous threat so efforts to try and better protect them, such as translocation, are crucial for future generations,” WWF said in a statement on Friday.
The relocation of endangered animals, known as translocation, involves putting them to sleep for the journey and then reviving them in a process which carries risks.
But the loss of half of them is highly unusual.