It is now emerging that Congress MP Shashi Tharoor had accused the Delhi Police of "repeatedly physically assaulting" and intimidating his domestic help into "confessing" that they both murdered her.

In a letter written to Delhi Police Commissioner B S Bassi on November 12 last year, he had said that "such conduct" by a Delhi Police officer against his domestic help Narayan Singh was completely unacceptable and illegal.

Tharoor said he and his staff had "cooperated fully" with the police probing the case. "I was therefore shocked and appalled to learn that in the course of the 16-hour interrogation conducted by four Delhi Police officers on Friday (7/11/14) and again during the 14- hour interrogation on Saturday (8/11/14), my domestic helper Narayan Singh was repeatedly physically assaulted by one of your officers.

"Worse, the officer used the traumatic physical assault to try and intimidate Narayan into 'confessing' that he and I murdered my wife," Tharoor said in the letter.

Tharoor also referred to his telephonic conversation with Bassi on November 8 when he had expressed his concerns about the alleged police action.