DENVER — Firearms sales are surging in the wake of the Colorado movie theater massacre as buyers express fears that anti-gun politicians may use the shootings to seek new restrictions on owning weapons.

In Colorado, the site of Friday's shooting that killed 12 and injured dozens of others, gun sales jumped in the three days that followed. The state approved background checks for 2,887 people who wanted to purchase a firearm — 25 percent more than the average Friday to Sunday period in 2012 and 43 percent more than the same interval the week prior.

Dick Rutan, owner of Gunners Den in suburban Arvada, Colo., said requests for concealed-weapon training certification "are off the hook." His four-hour course in gun safety, required for certification for a concealed-weapons permit in Colorado, has drawn double the interest since Friday.