Nellore: Chillakur police on Sunday registered criminal cases against 13 persons, including Chillakur mandal ex-tahsildar Geetha Vani and revenue inspector Siraj for their alleged involvement in the land scam at Tamminapatnam village in Gudur division. It may be recalled that Nellore district collector Chakradhar Babu had in July ordered Gudur sub-collector to probe alleged tampering of land records in Chillakur …