Article Photos: Two fatal Oklahoma tornadoes upgraded to EF-4 rating 12/239

Dustin Moss, left, and Rory Farmer use chain saws to cut up damaged trees in the Dripping Springs Estates Saturday, May 15, 2010. Saturday hundreds of volunteers went into areas that had been affected by last week's tornadoes to help clear debris. Photo by Doug Hoke, The Oklahoman.