Self-confessed 'vampire' killer Masten Milimu Wanjala will be detained for 30 days as police investigate more than eight child killings.
Police said the number of victims probably would rise to 13, almost all boys. They have searched in Nairobi, Bungoma, Kiambu and Machakos.
Wanjala's accomplices have been identified and are being traced.
Wanjala appeared before Makadara chief magistrate Angello Kithinji on Tuesday when police said they needed more time to complete investigations.
Wanjala was arrested in mid-July and led police to crime scenes. He said he drugged young boys and sometimes drank their blood.
He was arrested by a DCI team from Shauri Moyo.
The police said the murders took place in different parts of the country.
Investigating officer Peter Kamau said in an affidavit eight child victims have been identified. Their bodies were recovered through information from the accused.
He said five more bodies are expected to be recovered
"In the past two weeks the respondent has given information regarding some accomplices in some of the murders," Kamau said.
"With the help of the respondent, we are in the process of tracing and arresting accomplices," he said.
Kamau said that with Wanjala's help, they are tracing witnesses and compiling case files for each victim. He said the team must travel from Nairobi, where some victims were found, to Bungoma, Kiambu and Machakos.
He emphasised that Wanjala is essential to the investigation.
On August 18, Kamau said, Wanjala and the team took over the file of the murder of Purity Mwongela Nzau. She is believed to be an early girl victim.
He said between August 24 and 29, investigators focused on Majengo area to document the disappearances of Junior Mutuku Musyoki, Charles Odindo Bwala and Brian Omondi.
The suspect led the team to Bungoma to trace Simon Kifa Simiyu, age five, Emmanuel Sikuku Wafula, age nine, and Augustine Wafula Mukhongo, age 13.
Kamau said between August 31 and September 6, investigators confirmed the identities of the Bungoma victims. They recovered exhibits, including clothing, from Wanjala's grandparents' house in Bungoma.
Wanjala stayed with his grandparents between killings, the investigator said.
(Edited by V. Graham)
