Police in Kenya have called off the exhumation of two alleged mass graves after they only found a human foot there, officials said. The exhumation was canceled after police said earlier this week that an unknown number of bodies were buried in the graves found near the Tana River Delta, the BBC reported Thursday. The head of the operation, Antony Kamitu, said officials believe four bodies were removed before the police found the graves and sealed off the area. \"We believed the bodies were removed to hide the identities. Our plan was to take fingerprints of the bodies and that would have led us to their origins,\" he said. \"So the operation is now called off.\" More than 100 people have been killed during clashes between the Pokomo people and the Orma people in the past month, the BBC said.