New Delhi, (PTI) The Centre today issued a country- wide alert asking states to step up vigil to foil any attempt by Pakistan-based terror groups to avenge the surgical strike on their launch pads in PoK even as Home Minister Rajnath Singh reviewed security situation along the Indo-Pak border.

Security agencies were also apprehending stepped up action by militants currently operating in Jammu and Kashmir targeting security forces and civilians following yesterday's surgical strike by special forces of the Army on seven terror launch pads in Pakistan-occupied Kashmir(PoK).

Security was strengthened at vital installations across Punjab and a high alert has been sounded at all airbases across the state while evacuation of people residing in villages along the International Border continued.

During the hour-long meeting with the country's top security brass, Singh instructed the officials to ensure that the forces posted along the border remain on alert as the situation along the Indo-Pak border continues to be volatile, official sources said.

The Army, meanwhile, trashed reports in Pakistan about Indian casualties during the operation, saying one member of the special forces received minor injury during exfiltration but it was not due to any enemy or terrorist action.

The operation was a clinically planned one and the attack on the seven launch pads were carried out simultaneously, sources said.

The sources said it was a moonless night and total darkness helped the special forces bring in the element of surprise with total effectiveness.

It has been estimated that casualties was at least 40 on Pakistani side but there was no official confirmation.

Choppers also hovered over several sectors on the Indian side of the LoC to divert attention of the Pakistani security forces guarding various posts.