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In page Insurgency in Punjab:

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Interrogation reports of Sikh militants arrested in India gave details of the training of Sikh youth in Pakistan including arms training in the use of rifle, sniper rifle, light machine gun, grenade, automatic weapons, chemical weapons, demolition of buildings and bridges, sabotage and causing explosions using gunpowder by the Pak-based Sikh militant leaders and Pakistani army officers. A dozen terrorist training camps had been set up in Pakistan along the International border. These camps housed 1500 to 2000 Sikh militants who were imparted guerilla warfare training.[2] These reports also suggest plans of Pak ISI through Pak based terrorists to cause explosions in big cities like Amritsar, Ludhiana, Chandigarh, Delhi and targeting of VVIPs.[3][4]