Residents say the volcano spewed a cloud of ash , darkened the sky . San Cristobal Volcano erupted Saturday , a news agency says . Three explosions send ash and ashes more than two miles into the sky . The volcano 's last known eruption was last year , it says .
Residents say the volcano spewed a lot of ash , darkened the sky . San Cristobal Volcano erupted Saturday , a government agency reports . Three explosions send gas and ashes more than two miles into the sky . The volcano 's last known eruption was last year , Smithsonian says .