WILMINGTON, Del. (AP) — A law enforcement official says the gunman in a Delaware courthouse shooting that left three dead was the ex-father-in-law of one of the victims.

OAKDALE, Minn. (AP) — A gunman apparently firing randomly at vehicles killed a 10-year-old and wounded the child's mother and another woman Monday night, Oakdale's police chief said. The suspect was in custody.

PYONGYANG, North Korea (AP) — Defying U.N. warnings, North Korea on Tuesday conducted its third nuclear test in the remote, snowy northeast, taking a crucial step toward its goal of building a bomb small enough to be fitted on a missile capable of striking the United States.

WASHINGTON (AP) — Chuck Hagel — Republican, twice-wounded Vietnam combat veteran and former Nebraska senator — faces his first major hurdle in his bid to become the nation's defense secretary as a bitterly divided Senate Armed Services Committee pushes toward a vote on his nomination.

CHICAGO (AP) — Chicago police say two gang members charged in the death of a 15-year-old honor student mistook her and her friends for members of a rival gang and attacked the group in retaliation for a shooting that injured one of them over the summer.

WILMINGTON, Del. (AP) — A gunman opened fire Monday morning in a Delaware courthouse lobby just as the building was opening to the public for the day, exchanging shots with police and leaving three people — including the shooter — dead, authorities said.

CHICAGO (AP) — Shootings and other traumatic events involving children are not rare events, but there's a startling lack of scientific evidence on the best ways to help young survivors and witnesses heal, a government-funded analysis found.