Lawyers representing 9/11 families are asking a federal judge to find Iran culpable in the Sept. 11 terror attacks, saying new evidence shows Iranian officials had advanced word of the attacks and helped train the hijackers.

The lawyers filed papers Thursday in U.S. District Court in Manhattan saying there is “clear and convincing” evidence to conclude default judgment damages should be paid to their plaintiffs — families and personal representatives of some of those killed in the attacks.