New Delhi, Feb 21: The Central Bureau of Investigation (CBI) today arrested suspended Delhi Police inspector Puran Singh and sub-inspector Gaurav Agarwal on charges of complicity in the multi-crore fake stamp paper scam. The CBI spokesman said the agency's sleuths nabbed both the accused this evening and their interrogation was on. During raids in the residential and official premises of the accused the CBI had seized many incriminating documents. Bureau Report