Guwahati, Nov. 8 (PTI): A senior officer of the Assam Police and three doctors of a state-run hospital were arrested in Darrang district for allegedly covering up the rape and murder of a 13-year-old tribal girl, police said on Tuesday. The then additional superintendent of police of Darrang Rupam Phukan was arrested for allegedly taking a bribe from the accused, said a statement issued by the state CID. Three doctors of the Mangaldai Civil Hospital — Arun Chandra Deka, Ajanta Bordoloi and Anupam Sharma — who had conducted the first post-mortem examination on the victim’s body were arrested for “several commissions and omissions”, it said. The girl was found dead in June at a house in Dhula police station area where she worked as a domestic help. The main accused, Krishna Kamal Baruah — the owner of the house, was arrested, and is at present in judicial custody. Phukan, an Assam Police Service officer who was suspended earlier, had allegedly received