The CBI took over the probe into the murder of Gurgaon schoolboy Pradyuman Thakur before the Gurgaon Police's own special investigation team could finish its work, the police in the Haryana megapolis said.Gurgaon Police have come under fire from the parents of the murdered boy after the Central Bureau of Investigation took custody of a 16-year-old boy for allegedly slitting Pradyuman's throat -- changing the direction of the probe as earlier the police had pinned the murder on a bus conductor of Ryan International School, Ashok Kumar.