This evening, while BGE crews worked to install a gas line in the 400 Block of W. Pratt Street, a water main line was struck, causing an immense amount of water to spill into the street. Once DPW was notified and while waiting for their arrival, a steam explosion occurred, causing gravel and pieces of the roadway to explode. Four people were injured; three people were transported to the hospital with non-life threatening injuries; and one refused treatment.