Two people have died after a small plane attempted to make an emergency landing on Interstate 75 in southwest Florida on Friday afternoon, colliding with a vehicle and bringing traffic to a halt as a massive plume of black smoke rose into the air, according to AP.

The crash landing happened near the Pine Ridge Road exit in Collier County, just north of where the interstate heads east toward Fort Lauderdale along what is known as Alligator Alley.

The Federal Aviation Administration identified the aircraft as a Bombardier Challenger 600 jet and said five people were aboard when the crash happened around 3:15 pm.

The plane had taken off from an airport at Ohio State University in Columbus, Ohio, at about 1 p.m. and was scheduled to land in Naples around the time of the crash, Naples Airport Authority spokesperson Robin King said. A pilot had contacted the tower requesting an emergency landing, saying they had lost both engines.

The pilot was cleared to land on a runway but replied “we’re not going to make the runway. We’ve lost both engines,” according to a tape of the call cited by the Naples Daily News.

Collier County Sheriff’s Office spokesperson Adam Fisher confirmed two deaths, but said he didn’t immediately know whether the victims had been passengers on the plane or were on the ground.

According to the FlightAware aircraft tracker, the plane was operated by Hop-a-Jet Worldwide Charter based in Fort Lauderdale, Florida. The aircraft had been scheduled to fly back to Fort Lauderdale Friday afternoon.

Hop-a-Jet said Friday night that it had “received confirmed reports of an accident involving one of our leased aircraft near Naples” and would send a team to the crash site, the Naples Daily News reported.

“Our immediate concern is for the well-being of our passengers, crew members, and their families,” the statement said. It didn’t contain details of the crash.

The FAA and the National Transportation Safety Board will investigate, with the NTSB leading the investigation. One NTSB investigator arrived at the crash site Friday afternoon, with several more expected to arrive on Saturday. They will document the scene and examine the aircraft, which will then be taken to a secure facility for further evaluation. A preliminary report about the cause of the crash can be expected in 30 days.

Southbound lanes of the interstate remained closed late Friday night, according to the Florida Highway Patrol.