Meanwhile, the authorities extended curfew to many areas of Kashmir and snapped mobile telephony as part of a bid to foil a march called by separatists.
In the valley, more than three dozen incidents of stone pelting were reported from different districts including Anantnag, Pulwama, Kulgam, Shopian, Baramulla, Sopore, Kupwara and Bandipora, a police spokesman said.
35 people were injured in these incidents and the ensuing clashes after Friday prayers.
"After Friday prayers, a mob turned violent and attacked the police party that was deployed in the town to maintain law and order and started pelting stones on them," Deputy Inspector General of Police (Doda Range) Nisar Ahmed said, adding 12 people were injured in these.
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"A duty magistrate who was there on the duty with the police was hit on head with the stones," he added.
To disperse the mobs, police used cane charge and lobbed teargas shells, leaving six protesters injured.
In Kashmir, one protester was hit by tear gas shell in the head during clashes in Tangmarg area of Baramulla district. He was admitted to a hospital in Srinagar and his condition is stated to be critical, a police official said.
"After Friday prayers, miscreants assembled at various places and tried to disrupt the vehicular movement. At most of the places the miscreants started pelting stones on moving vehicles, police and security force deployments," the police spokesman said.
At Arhama, Ganderbal, miscreants assembled on road and pelted stones on security forces. While tackling the situation six persons were injured, he said.
The spokesman said at Dooru, Tangmarg, about 300-400 miscreants assembled on road and pelted stones on police and security forces. Two persons were injured, one of whom was shifted to Srinagar, he added.
"At Uttrsoo, Anantnag, miscreants pelted stones on police and security forces. While dispersing the mob, four persons suffered minor injuries who were discharged after first aid from the hospital," the spokesman said.
Curfew was in place in entire Srinagar district, Anantnag town, Shopian town, Baramulla town, Awantipora and Pampore towns of Pulwama district, an official said.
He said curfew was also imposed in Ganderbal town, Budgam, Chadoora, Magam, Kunzer, Tangmarg and Pattan areas of the valley as a precautionary measure to maintain law and order.
Last Friday saw intense clashes between protestors and security forces at many places in the Valley after the congregational prayers. The clashes left three people dead and several hundred others injured.
Normal life remained affected in the Valley for the 35th consecutive day due to the curbs imposed by the authorities and separatist-sponsored strike against the killing of civilians in the security forces action.
As many as 55 people, including two cops, have died and several thousand others injured in the clashes between protestors and security forces.
Schools, colleges, business establishments, petrol pumps and private offices remained closed while public transport remained off the roads. The attendance in government offices and banks was also thin, the official said.
Mobile Internet services continued to remain snapped in the entire Valley.
The separatists have extended the shutdown call in Kashmir till August 18 and as part of the protest programme has asked the people to hold "referendum" march at La Chowk on August 13 and 14.