Violence in Kashmir valley of northern Indian state Jammu and Kashmir escalated further on Sunday when seven persons including a woman were killed in separate incidents with four of them perishing in a blast after explosives went off in a police station set afire by a mob, according to PTI. With the seven deaths, the number of people killed in the fresh wave of violence since Friday has risen to 13. In New Delhi, the Cabinet Committee on Security(CCS) met Sunday night for the second time under a month to take stock of the situation in Kashmir valley. Jammu and Kashmir Chief Minister appealed for calm and asked political parties and leaders to cooperate with the Government to bring back peace in the state. He vowed to deal sternly with law breakers and the perpetrators of violence, asserting that he will not allow them "to win". Four civilians were killed and 35 others injured when a mob set afire tonight to a police station, where explosives were stored, triggering a massive blast in Khrew area on outskirts of Srinagar city, police said. A mob had laid siege to the police station, 20 kms from here, and started pelting stones after which additional forces were rushed to the area who rescued the police personnel in the police station. Police said a loud explosion took place as the protesters set afire the abandoned police station, where some explosive materials besides a cooking gas cylinder were also kept. Four civilians were killed and 25 others injured in the explosion, they said.