Curfew was on Tuesday clamped in the border district of Poonch, a day after a mob protesting against alleged desecration of a holy book in the US clashed with police leaving 20 people injured. Curfew has been imposed in Poonch since Tuesday morning in view of the tense situation, police said. Additional police and paramilitary forces have been deployed in the sensitive areas of the border town and strict curfew is being imposed, he said. Security has also been beefed up around a school belonging to a minority group. About 8,000 people had taken out a procession from Parade Ground in the border town on Monday and raised anti-US and pro-Islamic slogans. When police tried to stop them, the protestors had turned violent and resorted to stone pelting on police and later set afire forest building and some vehicles. Police then used teargas and also fired about 30-40 rounds in the air to disperse the stone-pelting crowds. Over 20 people, including four policemen were injured during the clashes. The protestors later reached Idgah Chowk where they held a dharna till last night.