Terror groups in the Kashmir Valley suffered a major setback as 13 terrorists were gunned down in counter-insurgency operations in three different areas in South Kashmir in which three Army jawans and two civilians were also killed. Jammu and Kashmir Police chief S P Vaid said this is one of the biggest counter-offensives in recent times against terror groups operating in the Kashmir Valley. The operations by security forces rendered a severe dent to militant groups such as the Hizbul Mujahideen and the Lashker-e-Taiba, officials said.