(CNN) — The man charged with killing 10 people in a Boulder grocery store passed a background check and purchased the weapon used in the slaughter, a Colorado gun shop told two Denver news outlets.

Additional charges are expected to be filed against the suspect in the mass shooting at a grocery store in Boulder this week, including attempted first-degree murder, Colorado authorities announced ...

BOULDER, Colo. — Colorado’s gun background check system "worked as designed" when the Boulder attack suspect was prevented from buying a gun in the months before the attack, the Colorado Bureau of ...