Jana Reddy said about 500 people were in the auditorium at the time of the incident.
The blast ripped through the middle row of the auditorium when the show had just begun.
So powerful was the blast that some of bodies were flung into the air and scattered over the area.
Hyderabad Police Commissioner Balwinder Singh said the toll at Lumbini Park, overlooking the picturesque Hussain Sagar lake, may go up as it was teeming with week-end crowd.
Jana Reddy said that "according to preliminary reports, it was a terrorist act."
Photograph: Snaps India
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