A Kenyan man described by authorities as a “bloodthirsty vampire” has confessed to the grisly slayings of 10 children — in some cases, sucking their blood before killing them, police said.

Masten Milimo Wanjala, 20, was arrested Wednesday in connection to the killings of two children whose bodies were found in a wooded area of the capital, Nairobi, the country’s Directorate of Criminal Investigations said Wednesday.

But in a disturbing confession, Wanjala admitted to the “cold-blooded murders” of at least 10 young teens, police said.