<p>Kolkata: Three persons were killed and several others injured in a coal mine blast in West Bengal's Birbhum district on Monday, police said.</p>.<p>The incident happened this morning in a coal mine in Bhadulia block, they said.</p>.<p>"So far we have recovered three bodies. Rescue operations are on," a senior police officer said.</p>
<p>Kolkata: Three persons were killed and several others injured in a coal mine blast in West Bengal's Birbhum district on Monday, police said.</p>.<p>The incident happened this morning in a coal mine in Bhadulia block, they said.</p>.<p>"So far we have recovered three bodies. Rescue operations are on," a senior police officer said.</p>