NEW DELHI: 41 points identified on the International Border (IB) of Punjab which have riverine unfenced stretches will all be covered by a laser wall on priority to eliminate chances of human error in allowing terrorists to infiltrate from Pakistan. This follows directions after PM Narendra Modi ’s aerial survey of the border last week and concern over repeated intrusions.The suspected infiltration point of Ujj River in Bamiyal used by terrorists in the case of the Pathankot attack was not covered by a laser wall. A camera to keep watch here over the 130-meter wide river bed was found to be not recording the footage. ET has learnt that BSF has now covered this stretch with a laser wall last week, just before the PM’s trip. The equipment, which is fabricated in-house by BSF, for another stretch was diverted to cover this point. Only 5-6 out of the 41 vulnerable Punjab points are covered by laser walls – this beam over the river sets off a loud siren in the case of a breach.BSF had started putting laser walls on unfenced riverine stretches of IB last year, starting off in the Jammu sector which was more prone to terrorist intrusions till the Gurdaspur strike last July exposed the Punjab route. The infiltration for Gurdaspur attack was suspected 5 kilometers downstream of Bamiyal near the Tash border out post – a riverine point not covered by a laser wall as well. A senior government official said that the BSF conceded before the PM that “it could be possible” that terrorists in case of Pathankot infiltrated from Bamiyal due to a “human lapse”. BSF has found no tunnels.“The said point at Bamiyal has BSF posts on either side of the bank with a personnel on each post keeping a watch on the river at all times – the area is lit up with high mast lights, the official told ET. “The river is just a stream at this time…the terrorists may have possibly walked through the dry river bed at night and BSF personnel may have missed them,” an official said. BSF has foiled 69 infiltration attempts in the Jammu sector of the IB last year – it has been pressing for more manpower in the Punjab sector since October since deployment in Jammu vis-à-vis Punjab is in the ratio of 2.5:1.BSF has pointed out that Bamiyal is not a known drug trafficking route with no drugs being seized here over the past 3-4 years. It has also made a case that unfenced riverine stretches on Punjab border were being guarded with additional measures like boat patrolling. Further, neither has an additional camera at Bamiyal covering a wide area including the approach to the river has captured any intrusion nor any footmarks have been found near the river bed here. “BSF however is not in denial mode anymore and admits that intrusion possibly happened from Punjab border,” a top official said.