The Coast Guard Captain of the Port has reopened the Houston Ship Channel from Cotton Patch Bayou to Sims Bayou after a precautionary safety zone had been put in place due to an explosion at Pasadena Refining System, Inc., Saturday morning. At 10:30 a.m., a Sector Houston-Galveston watchstander observed smoke rising in the sky over the tree-line outside an office window and coordinated with Vessel Traffic Service Houston-Galveston watchstander's, who observed the smoke coming from the facility and found other responders were already enroute. The Captain of the Port closed the channel at 10:40 a.m., until Coast Guard hazmat teams were able to investigate the scene for any impact from possible chemical release in the air or any impact on the waterways.