Weeks of flooding in southern Pakistan killed at least 347 people and injured more than 600, the national disaster authority said Monday. The region, with Sindh Province being the worst hit, has been devastated by massive flooding unleashed by torrential monsoon rains since early August. Millions of people have been affected by the floods. CNN reported about 500,000 are sheltered in refugee camps. Pakistani Prime Minister Syed Yousuf Raza Gilani canceled his trip to New York for the U.N. General Assembly session so he could supervise flood relief work, his spokesman said Friday. In Sindh, water was standing anywhere from ankle-high to above the knees on empty lands where homes once stood, CNN reported. United Nations agencies are distributing food and supplies to the affected areas. The World Food Program estimates that 73 percent of the food crops and 36 percent of the livestock have been lost in the flooded areas. The area had barely recovered from similar floods that killed about 2,000 people last year.