Federal investigators looking into the collision between an Air Canada jet and a fire truck at New York’s LaGuardia Airport are reviewing the cockpit voice recorder and the actions inside the control tower. The National Transportation Safety Board plans to share more details at a news conference Tuesday. The plane carrying more than 70 people slammed into the fire truck while landing late Sunday night. The two pilots were killed and several passengers were injured. But most were able to escape the mangled aircraft.   Investigators want to know more about the role of the air traffic controllers and whether they were distracted by an emergency with another plane just before the crash.