Former minister Shashi Tharoor is presently being questioned for the second time in connection with his wife, Sunanda Pushkar's murder.
The interrogation round is underway at the SIT office in south Delhi's Vasant Vihar area. Tharoor's domestic help, Narain Singh, is also likely to be questioned by the SIT today.
"Shashi Tharoor and a few others are being summoned today. On the basis of evidences collected till now, we needed clarification on some points," said Bassi.
"I will be able to give you results only after the investigation is completed," he added.
Last week, Sunanda Pushkar's son, Shiv Menon, was also interrogated by the Special Investigation Team (SIT).
Last month, Tharoor was interrogated at the Vasant Vihar police station in South Delhi.
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The police had earlier in January said that based on available evidence, Sunanda Pushkar, 51, was poisoned. A case of murder was registered on January 6.
Sunanda Pushkar was found dead in the five-star Leela Hotel in Delhi on January 17, 2014.
She was married to Tharoor for a little less than four years. It was the third marriage for both. Before her death, Pushkar had publicly accused Tharoor of having an affair with a Pakistani journalist, Mehr Tarar.
Initially, her death was debated as a possible suicide for months, and it was only this month, that a murder theory began to be considered seriously after doctors at the All India Institute of Medical Sciences (AIIMS) maintained that her demise was unnatural.
Tharoor has been demanding that the investigation must be "free of political pressure or a pre-determined outcome.