WILMINGTON, Del. — Motivated by a yearslong custody dispute, a gunman opened fire Monday morning in a Delaware courthouse lobby as the building was opening to the public for the day, exchanging shots with police, authorities said. Three people, including the gunman, died.
‘‘It happened so fast,’’ said Jose Beltran, 53, an employee at the New Castle County Courthouse who was entering the lobby when he heard two shots. He said he turned around and heard three or more shots as he ran.