Najib Balala, Kenya's cabinet secretary for tourism and wildlife, wrote in a tweet on Friday that he had directed the wildlife workers to immediately suspend the transport of the remaining three rhinos.
In May, three black rhinos were killed in Kenya's Meru National Park.
In an earlier statement by Kenya Wildlife Service during the exercise, by the end of 2017, Kenya had a rhino population of 1,258 having grown from less than 400 rhinos in the 1980s. "The high salt levels lead to dehydration that triggers thirst mechanism, resulting in excess water intake of the saline water that further exacerbates the problem".
Seven black rhinos have died in unclear circumstances at the Tsavo East National Park.
As reported by AP, animals were killed after they were moved from the capital to a new national Park, hundreds of kilometers away from Nairobi.
Efforts to save the black rhino from extinction have suffered a "catastrophic setback" after eight of them died in Kenya during a botched operation to move them to a more secure home.
Kenya's government said it has invited Peter Gathumbi, a senior veterinary pathologist from the University of Nairobi, to carry out an independent investigation.
The surviving rhinos are being corralled into fortified sanctuaries with the aim of enhancing breeding.
"Translocating wild animals of this size is extremely challenging and not without risk", Awer said, "but black rhinos are under enormous threat so efforts to try and better protect them, such as translocations, are crucial for future generations".
The rhino population has dwindled in part because of targeting by poachers, who want the animals' horns.
According to KWS figures, nine rhinos were killed in Kenya previous year.