Police inspector-general PK Tiwari said preliminary investigations suggested it was a crude bomb, placed under a seat in the hospital reception area, according to the Press Trust of India news agency.
"I heard a bang sound and when I turned there were splinters of glass lying around and I saw three people injured," the witness told AFP, declining to give his name.
The blast comes less than two weeks after a powerful bomb in a briefcase ripped through a crowd outside New Delhi's High Court, killing 15 people and wounding dozens of others, many of them petitioners waiting for legal hearings.
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