Updated 7:47 p.m. | The authorities have arrested a man who law enforcement officials believe was planning to build and detonate a bomb in New York with government workers, returning military personnel and elected officials as the target, two people briefed on the case said on Sunday. Cyrus R. Vance Jr., the Manhattan district attorney, Mayor Michael R. Bloomberg and Commissioner Raymond W. Kelly of the New York Police Department announced the charges against the man at a Sunday evening news conference at City Hall. The man was arrested within the last 24 hours. The defendant in the case, identified...