Colorado wildfire updates: Quarry fire is being investigated as arson, Alexander Mountain grows to more than 9,000 acres The Denver PostQuarry fire: Jeffco sheriff opens arson investigation as crews hope to make progress on Friday. Colorado Public RadioLive updates: Quarry Fire burning in Jefferson County, Colorado | FOX31 FOX 31 DenverWildfires rage through Colorado, prompting hundreds to evacuate; 1 killed The Washington PostWestern wildfires latest: 1 dead in new Colorado blaze as containment expanded on huge California fire ABC News