A Calcutta police sub-inspector, who was deployed at SSKM Hospital for law and order duty, was found unconscious in a pool of blood on Saturday morning. His service revolver was lying next to him.

The 55-year-old sub-inspector has been admitted to a hospital with critical injuries.

An officer of Bhowanipore police station said around 9.15am, there was a report of a gunshot coming from behind the Woodburn ward inside the hospital. Police personnel and hospital staff found the on-duty sub-inspector at an under-construction building behind the ward.

Senior officers said it appeared to be a suicide attempt but the exact sequence of events would be clearer once the injured person would regain his senses.

The injured sub-inspector is a resident of BT Lines police quarters. On Saturday, he was attached with a heavy radio flying squad posted inside the hospital.

His family was contacted after the incident.