WASHINGTON — The Justice Department said Monday that it would work toward providing families of 9/11 victims with more information about the run-up to the attacks as part of a federal lawsuit that aims to hold the Saudi government accountable.The disclosure in a two-page letter filed in federal court in Manhattan follows longstanding criticism from relatives of those killed that the U.S. government was withholding crucial details from them in the name of national security.Nearly 1,800 families, victims and first …