Two pilots of an Air Canada plane were killed after their aircraft collided with a Port Authority vehicle late Sunday night at LaGuardia Airport, Port Authority Executive Director Kathryn Garcia said — leading officials to close the airport as they investigated what happened.

The airport remained closed early Monday as the Port Authority and National Transportation Safety Board investigated the crash. Garcia said LaGuardia would stay closed until at least 2 p.m. Monday. The closure is happening as LaGuardia travelers are already dealing with long security lines with hourslong waits due to the partial federal government shutdown affecting the Transportation Security Administration.

Air Canada Flight 8646 collided with a Port Authority aircraft rescue and firefighting vehicle that was responding to a separate incident around 11:40 p.m. Sunday, according to the interstate agency. Officials said the collision occurred on Runway 4 of the airport while the Air Canada plane was landing.

The flight carried 72 passengers and four crew members, according to the Port Authority. The rescue vehicle carried two people.

Officials said 41 passengers and crew on the Air Canada plane were transported to local hospitals and as of Monday morning, 32 had been released. The two officers in the Port Authority vehicle are in stable condition, authorities said.

“There are also serious injuries,” Garcia said at a news conference.

Jazz Aviation said its flight, operating as Air Canada Express, was heading to LaGuardia from Montreal. Garcia said the Port Authority vehicle was responding to a United aircraft “that had reported an issue with odor.”

U.S. Transportation Secretary Sean Duffy said the Federal Aviation Administration was sending a team to LaGuardia to assist with the investigation.

Air Canada said it set up a phone line to provide assistance for friends and family of passengers on the flight:1-800-961-7099.

New York City Emergency Management said a family center has been set up at the airport’s Terminal B. The agency said travelers should expect a “heavy presence of emergency personnel and vehicles, road closures, traffic delays near the airport, and flight cancellations.”

This is a developing story based on preliminary information from officials and will be updated.