Live: Updates on fatal crash at LaGuardia Airport from Transportation Sec.

(NewsNation) — Two pilots were killed Sunday when an Air Canada jet collided with a Port Authority fire truck on a runway at New York's LaGuardia Airport, according to transportation officials. There were 72 passengers and four crew members aboard the jet. More than three dozen passengers were taken to the hospital after the incident, as were two firefighters who were in the truck. Nine people, including both Port Authority firefighters, remained hospitalized Monday morning and "sustained serious injuries," Transportation Secretary Sean Duffy said. The CRJ-900 plane, which was coming from Montreal, may have been going above 100 miles per hour when it struck the vehicle, according to a statement from FlightRadar24 to ABC News. The jet was operated by Jazz Aviation, Air Canada's regional partner. Duffy, FAA Administrator Bryan Bredford and New York state and city officials provided limited updates from LaGuardia Monday afternoon. Duffy said he is unable to "give specifics on what went wrong," but said that the National Transportation Safety Board will provide judgment on "what should have happened in regard to air traffic control, trucks and airplanes." The NTSB is investigating the collision with the help of the Federal Aviation Administration. Bredford discussed the weather conditions at the airport Sunday night, and said there were moderate winds, mist and fog. The fire truck was responding to another flight, which had reported a smell, officials said Monday. The truck requested permission to cross the taxiway and was cleared by air traffic control. Released audio from air traffic control revealed that a controller told the fire truck to stop multiple times shortly after. "Just stop there please. Stop, stop, stop, truck one, stop, stop, stop ... Jazz 646, I see you collided with a vehicle there. Just hold position, I know you can't move," the controller said. Charley Pereira, a former National Transportation Safety Board official, told “Morning in America” the audio points to a “mistake” on behalf of the controller. “From initial speculative thoughts, it sounds like the controller should’ve known that the airplane was going to be coming down that runway,” he said. LaGuardia closed following the collision but reopened at 2 p.m. on Monday. Duffy said it will operate at "reduced capacity for some time" while the fire truck and airplane remain in their positions during the investigation. The U.S. Federal Aviation Administration issued a ground stop on Sunday for all planes at the airport, which the Associated Press reports occurred at 11:38 p.m. At least 18 flights were diverted because of the crash. Those who believe loved ones may have been on Air Canada Express flight AC8646 can call 1-800-961-7099 for more information. Michael Rousseau, President and Chief Executive Officer of Air Canada, put out a statement Monday morning regarding the accident. "We know there are many questions, but at this early stage we do not have all the answers," Rousseau said. The FAA and the New York Fire Department did not immediately respond to requests for comment. The FAA said Newark Liberty International Airport — one of the three major facilities serving New York City and its New Jersey neighbors — temporarily paused both arrivals and departures on Monday morning. Air traffic controllers had to evacuate a tower "because of a burning smell coming from an elevator" around 7:30 a.m. EDT. It has since resumed flights. Reuters and NewsNation's Michael Ramsey, Anna Kutz and Zach Kaplan contributed this report.