Chandigarh, Feb. 4 -- A mysterious blast-like sound was heard near a dysfunctional police post on Fatehgarh Churrian Road in Punjab's Amritsar on Monday, prompting city police Commissioner Gurpreet Singh Bhullar to visit the scene for assessing the situation.

Preliminary investigation suggests that the noise may not have been caused by a grenade blast, but the police are not ruling out the possibility entirely.

"The impact is negligible, and first impressions don't indicate a blast," said Bhullar. "However, we are investigating the matter from all angles to determine the cause of the noise."

Bhullar revealed that a police checking point (Naka) was set up on Fatehgarh Churrian road near the main Amritsar bypass. Police personnel on dut...