A large number of AK-47 assault rifles and grenades dropped in Amritsar by heavy-lifting drones that came from Pakistan, just across the border, was for terrorists to create trouble in Jammu and Kashmir, sources in the Punjab Police have told NDTV. The drones carried out eight 'sorties' in 10 days this month to drop the weapons, including satellite phones, on Indian soil, the sources said, asking not to be identified. These flying machines can carry up to 5 kg and they flew fast and low to evade detection, sources said.