New Delhi: Delhi Police has questioned some key witnesses besides sending three mobile phones and a laptop for advance forensic investigations in the mysterious death of Sunanda Pushkar.

The bed sheet, carpet on which fluid marks were found and broken glass, which were recently recovered from suite number 345 of Leela Palace Hotel, where Pushkar, wife of former Union minister Shashi Tharoor, was found dead, has also been sent to forensic labs for examination.