The Global Positioning System (GPS) devices the terrorists were carrying were switched on after they crossed into India from Pakistan, probably through a canal of the Ravi river, sources said.
The Ravi flows down from Himachal Pradesh to the Jammu border before entering Punjab at Madhopur. It criss-crosses the Indo-Pak border thrice before finally flowing into Pakistan ahead of Gurudaspur and merges with Chenab river.
As the currents were very strong, security agencies believe they used one of the canals to enter India and then switched on the two GPS devices, which were recovered from the encounter site at Dina Nagar yesterday.
The 15 km stretch from the point they crossed over into India at Bamiyal was covered by the terrorists on foot before they planted five Improvised Explosive Devices on Talwandi-Amritsar railway track, they said. A night vision device has also been recovered from the railway track, sources said.
State police chief Sumedh Saini said grenades with 'Made in China' markings were recovered from the terrorists who were killed in retaliatory action by the Punjab police commandos.
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