- Boulder shootings: suspect allegedly bought assault rifle after ban on sale was blockedThe Guardian
- What we know about Boulder shooting suspectCNN
- ‘We stand with you,’ NASA’s Perseverance rover team tells people of Boulder after mass shootingSpace.com
- Gun debate reignited with new focus on Boulder city banFOX 31 Denver
- 10 killed in supermarket shooting in Boulder, Colorado | WNTABC News
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