NEW ORLEANS (MCT) — President Barack Obama vowed Wednesday night to “leave no stone unturned” in seeking to curb violence in American cities, including reasonable restrictions on gun ownership — a sharp break from the position set out earlier in the day by his Republican opponent Mitt Romney.

The president offered his most extensive comments in some time on the issue of gun control in a speech to the National Urban League, which closed a four-day trip that began in Colorado, where he met with victims of the movie theater shooting that claimed a dozen lives. After that meeting, he had reflected on those affected by the shooting, but did not suggest a fresh attempt to restrict gun ownership.