LES CAYES, Haiti—The death toll from a magnitude 7.2 earthquake in Haiti soared to at least 1,297 Sunday as rescuers raced to find survivors amid the rubble ahead of a potential deluge from an approaching tropical storm. Saturday’s earthquake also left at least 2,800 people injured in the Caribbean nation, with thousands more displaced from their destroyed or damaged homes. Survivors in some areas were forced to shelter in streets or soccer fields with their few salvaged belongings while overloaded hospitals scrambled to help those who were injured. Yet the devastation could soon worsen with the coming of Tropical Depression Grace, which is predicted to reach Haiti on Monday night. The U.S. National Hurricane Center demoted the tropical storm to a depression Sunday, but forecasters warned that regardless, Grace still posed a threat to bring heavy rain, flooding and landslides. The earthquake struck the southwestern part of the hemisphere’s poorest …