NEW DELHI: In its probe into the death of Sunanda Pushkar, Indian police are seeking the list of passengers who travelled from Dubai and Pakistan to New Delhi, and vice versa, on and around January 17 — the day the wife of former Indian minister Shashi Tashoor was found dead in a New Delhi hotel, a report on the Times of India's website quoted sources as saying.

Though none of the police officers were willing to confirm the details, sources were quoted as saying that the Foreigners Registration Office or Foreigners Regional Registration Office (FRRO) which comes under the intelligence bureau had been asked for the information.

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The request indicates that the involvement of a ‘foreign hand’ in the incident was being investigated.

About the passenger list being obtained, sources said that among other people who entered and exited India’s capital city around the time of death, the New Delhi Police was also trying to determine if any person from Pakistan or Dubai had visited the Indian capital or left it on the day Sunanda Pushkar was found dead.

Sources further said that after obtaining the list of passengers, investigators will select ‘suspicious’ travellers and try to question them.

They added that more than a thousand passengers will be needed to be checked.

Some investigators have said that the possibility of suicide as a cause of Pushkar's death has not yet been ruled out.

Pushkar was a Dubai-based entrepreneur before she married Shashi Tharoor in 2010.

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She was found dead in a five-star hotel in New Delhi under mysterious circumstances on Jan 17 this year, a day after she had accused Pakistani journalist Mehr Tarar of “stalking” her husband and of trying to “break” her marriage when she was away for medical treatment for three months.

Tarar had denied Pushkar’s accusation of an affair between her and the former high-flying UN diplomat.