A toxic cloud that formed after 300 gallons of hydrochloric acid leaked at a southeast Texas storage facility sent nine people to hospitals and forced thousands of residents indoors, an emergency management official said Thursday. Four firefighters were among those who were hospitalized for exposure after a tank ruptured at a storage facility near the Port of Texas City, Bruce Clawson of the local emergency management office said. More than 45,000 residents of Texas City were ordered by emergency management officials to remain indoors, turn off air conditioning units and make sure all windows and doors were closed until the vapor cloud dissipated.