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More than 10,000 calls warning residents to flee failed when the Waldo Canyon fire exploded near Colorado Springs in 2012. Thousands of people were left without warnings as flames destroyed 347 homes and killed two people.

Emergency alert failures dogged Colorado 10 years before the Marshall fire began its destructive tear through Boulder County, devouring almost 1,100 houses and prompting fresh scrutiny of a system that’s been blamed for failures in catastrophic fires nationwide, a review of after-action reports shows.

State officials say emergency alert systems have come a long way since those disasters. But critics say they remain woefully deficient as landlines become obsolete and technological advancements heighten residents’ expectations that they’ll be warned if they’re in danger…