Colombian migration officers check the identity documents of people trying to enter Colombia from Venezuela, at the Simon Bolivar International bridge in Villa del Rosario, Colombia August 25, 2018. The bridge is crammed with people trying to cross from dawn, Venezuelans without passports or special border cards are turned back. REUTERS/Carlos Garcia Rawlins SEARCH "MIGRANT TACHIRA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.