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The investigation into yesterday's explosion at a downtown Fort Worth Hotel continues today. Officials suspect a natural gas leak in the building that houses the Sandman Signature Hotel was the cause for the explosion. The bottom two floors of the building have heavy damage. Twenty-one people were hurt, one critically and four seriously. Fort Worth Fire crews conducted search and rescue operations at the site overnight and report no additional victims were found. There were no fatalities reported. Several streets in downtown Fort Worth remain closed as cleanup efforts get underway today.