Srinagar, July 29 -- In a major breakthrough, security forces on Monday killed the mastermind of the April 22 Pahalgam terror attack along with two of his associates in an encounter in Dachigam forest area in Harwan in outskirts of Srinaga.Sources have identified the slain Pakistani terrorist as Sulieman alias Hashim Musa, who is believed to be the mastermind of the April 22 attack."He was among three terrorists killed in a surprise operation named 'Operation Mahadev' launched police army in collaboration with police and paramilitary forces in the upper reaches of Dachigam forest area today following a technical signal indicating use of a satellite phone that was used by the perpetrators of the Pahalgam attack," they said.The other terror...