The explosion formed a crater in the police station compound and damaged window panes of the building and adjoining houses, Superintendent of Police Akhilesh B Beriar said.
Assistant Sub-Inspector (ASI) Md Ashraf, who was a member of the bomb squad, and a guard, identified as Mahendra Turi, were killed in the blast.
All the injured were ASI-rank police officers. They have been hospitalised.
It was not immediately clear whether proper procedure was followed while defusing the bomb.
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