Three more human bodies were retrieved from the Kware dumpsite on Saturday, July 13.
The Directorate of Criminal Investigations (DCI) said the bodies were content of three bags of the five removed from the site.
Two bags contained a dog carcass and garbage.
Owing to the state of the bodies and the manner in which they had been stuffed, the country's top investigation body suggested cultist acts could not be ruled out.
The first bag had two legs from the knee downwards, the second one contained two body parts, one from the neck to the waist and another from the head to the waist, and the third contained a lower limb from the thigh to the knee.
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The DCI, therefore, said they would be investigating possible ritualist activities and serial killings.
"We want to assure the public that our investigations will be thorough and shall cover a wide range of areas, including but not limited to the possible activities of cultists and serial killings," said the DCI in a statement on Saturday.
In the meantime, President William Ruto ordered the state security agents to expedite their probe into the possible killings of Kenyans.
Speaking in Elgeyo Marakwet county on Saturday, the president stated that Kenya upholds the rule of law and strictly observes human rights, hence the perpetrators of such acts cannot go unpunished.
"Close to nine bodies, mostly women, have been found in Nairobi. The government has begun its investigations. I have directed the police and all the relevant agencies to investigate what happened. I want to assure Kenyans that all those responsible for the killings will be brought to book. They will face justice," said Ruto.
"Killing a Kenyan for whatever reason is a crime under the constitution and contravention of human rights in a nation. Those who are charged with making sure that there are comprehensive investigations on the matter we have witnessed in Kware, where many Kenyans, including young girls, have lost their lives, must expedite that process and find the truth so that those involved in the heinous acts are taken to court," he added.
The DCI announced retrieving six bodies on Friday, July 12.