The National Transportation Safety Board (NTSB) is beginning its investigation into the deadly collision of an Air Canada regional jet landing at LaGuardia, New York, that killed two pilots and injured dozens of passengers. The NTSB is gathering data and investigating wreckage, including information on tower staffing. The investigation will take a year or longer. The first days of the investigation will be focused on data collection and witness statements. It will also address the role of two controllers in the control tower, their responsibilities, and if all proper procedures were followed. It is unclear who was responsible for the aircraft and vehicles on the ground, with conflicting information about who else was there. The National Transportation Transportation Safety Council will also investigate audio recordings of every tower's radio transmission and communication error.