The three-member CBI team is expected to question the school staff in connection with Pradyuman murder case.
The sources said the notification from the central government had been received and an FIR could be registered anytime soon.
The Haryana government has written to the Centre seeking a CBI probe into the gruesome murder of a seven-year old boy at Gurgaon's Ryan International School, a senior official said today.
Pradyuman was found dead, lying in a pool of blood, with his throat slit in the washroom of Ryan International school in Bhondsi area on Sohna Road on September 8.
The spokesperson of the premier investigative agency, which has taken over the probe from Haryana Police informed that the three accused- bus conductor, Ashok Kumar, the school's northern India head, Francis Thomas and coordinator and Human Resource (HR) head Jeyus Thomas have been taken into custody.
Pradyuman, a student of Class second, was brutally murdered inside the school's bathroom on September 8. Ashok Kumar one of the bus conductor was arrested the same day for allegedly killing the child. However, Kumar's parents and two other staffers claim he was being made a scapegoat.
The case has snowballed into a major national issue concerning safety and security of children in private schools, with vociferous protests by parents and activists outside the Ryan schools in several states including Mumbai and Navi Mumbai.
The Punjab and Haryana High Court on Wednesday refused to stay the arrest of trustees of Ryan International School - the Pinto family, including Augustine, his wife Grace and their son Ryan. Authorities ordered closure of the school till September 25, after it reopened on Monday.