FORT WORTH, Texas — Firefighters scoured the wreckage of a historic Fort Worth hotel on Tuesday as they investigated the cause of a massive explosion that shattered windows, littered the streets with debris and injured 21 people, including one critically.

       The Monday blast blew doors and sections of wall into the road in front of the 20-story downtown Sandman Signature Hotel, where authorities said rescuers found several people trapped in the basement. By evening, officials said everyone seemed to have been accounted for, but firefighters with dogs continued searching the rubble overnight.

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       The fire department is working with state and federal investigators and utility workers to determine the exact cause of the explosion, though authorities believe a gas leak was to blame. The department said Tuesday that no more victims had been found and that the area around the hotel would remain closed.