The questioning of Tharoor continued late tonight at the Anti Auto Theft Squad (AATS) office in Vasant Vihar in South Delhi even as Sunanda's viscera sample was sent to a FBI laboratory in the US for further probe.
Tharoor was quizzed by a five-member SIT team here for nearly five hours over two sessions during the day. Delhi Police had earlier examined the former minister on January 19.
Tharoor's domestic help Bajrangi and Narayan Singh, his common friend Sanjay Diwan, his PS Praveen Kumar and Rajat Mohan (cardiologist of Sir Ganga Ram Hospital) were questioned along with him earlier in the day. Besides, they were also separately quizzed.
Sources said that Tharoor faced tough questions on the IPL controversy which had broken out in early 2010 when he was minister of state for external affairs.
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There were allegations that he had "misused" his office to ensure that Rs 70 crore, which was equivalent to 19 per cent equity in IPL Kochi franchise Rendezvous Sports, was paid to Sunanda, a charge denied by him.
Police want to confirm whether the poison was radioactive isotopes, which cannot be detected in Indian labs, the sources said.
Tharoor first reached Sarojini Nagar police station and was later taken to the office of AATS around 11.30 AM where he was questioned by the SIT team.
The SIT team, headed by Deputy Commissioner of Police (DCP) Prem Nath and comprising Additional DCP P S Kushwaha and three senior officers asked Tharoor about his relations with Sunanda and some other aspects.
He was questioned about the circumstances in which Sunanda had left him at the airport after returning from Thiruvananthapuram to Delhi on January 15 last year and checked in at Leela Hotel, the sources said.
Police Commissioner B S Bassi said, "We called six witnesses today in the second round of questioning into the case. The SIT confronted them and once again recorded their statements.