PADANG, Indonesia — Heavy rains and torrents of cold lava and mud flowing down a volcano’s slopes on Indonesia’s Sumatra island triggered flash floods that killed at least 37 people and more than a dozen others were missing, officials said Sunday. [time-brightcove not-tgx=”true”] Monsoon rains and a major mudslide from a cold lava flow on Mount Marapi caused a river to breach its banks and tear through mountainside villages in four districts in West Sumatra province just before midnight on Saturday.