(CNN) — A Boeing B-17 Flying Fortress and a Bell P-63 Kingcobra collided and crashed at the Wings Over Dallas airshow around 1:20 p.m. on Saturday, according to the Federal Aviation Administration.

“At this time, it is unknown how many people were on both aircraft,” the FAA said in a statement.

Authorities responded to the incident at Dallas Executive Airport, Jason Evans with Dallas Fire-Rescue told CNN on Saturday.

There are currently more than 40 fire rescue units on scene, the agency’s active incidents page shows.

The FAA and the National Transportation Safety Board will investigate the collision. The NTSB will be in charge and is expected to provide additional updates.

The event, which was scheduled to run through Sunday, has been canceled, according to the organizer’s website.

Dallas Mayor Eric Johnson said in a tweet after the crash, “As many of you have now seen, we have had a terrible tragedy in our city today during an airshow. Many details remain unknown or unconfirmed at this time.”

“The videos are heartbreaking. Please, say a prayer for the souls who took to the sky to entertain and educate our families today,” Johnson said in a separate tweet.

Debris from the collision fell onto southbound Highway 67, according to a report from CNN affiliate WFAA. Southbound and northbound lanes of the highway were shut down after the incident, the Dallas Police Department said.

Rare vintage aircraft destroyed
The B-17 was part of the collection of the Commemorative Air Force, nicknamed “Texas Raiders,” and had been hangered in Conroe, Texas near Houston. It was one of about 45 complete surviving examples of the model, only nine of which were airworthy.

The P-63 was even rarer. Some 14 examples are known to survive, four of which in the United States were airworthy, including one owned by the Commemorative Air Force.

This is a developing story.

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