Through Saud Mehsud DERA ISMAIL KHAN, Pakistan (Reuters) – Sectarian violence unfold in Pakistan on Monday after clashes between minority Shi’ite and majority Sunni Muslims close to the capital Islamabad precipitated the government to impose a curfew and block cell phone services over the weekend. Tensions are excessive this month as Shi’ites mark Muharram, an annual length of mourning which has often sparked bouts of violence. Rawalpindi, a garrison metropolis close to Islamabad, remained beneath curfew and tight safety for 3 days after a Shi’ite procession on Friday degenerated into sectarian clashes which killed as a minimum eight people.