Quoting intelligence inputs, they said, there have been intensified attempts of infiltration by militants from across the border in recent past.
All these attempts were being made at the behest of ISI with the objective of carrying out terror attacks in hinterland, sources said.
The intelligence inputs suggested that a new strategy was hatched by ISI to expand the area of terror strike from Jammu and Kashmir and militants were being trained for the purpose, they said.
On 27 July, three terrorists in army uniforms opened fire on a bus and then attacked the Dina Nagar police station in Gurdaspur district of Punjab.
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Three civilians and four policemen, including a superintendent of police, were killed and 15 others were injured in the attack.
The GPS, recovered from the three slain militants, show that the devices had coordinates of 13 places in Punjab stored in them that include two temples and a college.
In yet another attack, two BSF personnel were killed and 14 others were injured when two militants attacked a BSF convoy on Udhampur yesterday.