A dozen people are missing and 48 injured by the floods, Ecuador’s SNGRE emergency service said on Twitter. Video footage showed torrents of water carrying stones, mud and debris down streets in the Ecuadoran capital, as rescuers helped inhabitants wade through the fast-running currents to safety. Many in the city of 2.7 million people were taken to shelters, as authorities declared three days of mourning starting Tuesday. Rain that drenched Quito for 17 straight hours caused a deluge that damaged roads, agricultural areas, clinics, schools, a police station and an electric power substation. Q…