PHILADELPHIA (TNND) — Four of the passengers killed in a medical transport jet crash in Philadelphia Friday have been identified by the Mexico-based company that was operating the plane.

Jet Rescue Air Ambulance said a child patient and five other people were on the Learjet 55 when it plummeted to the ground shortly after takeoff around 6:30 p.m.

The child had recently completed treatment at Shriners Children’s Philadelphia hospital for a condition not easily treated in Mexico, hospital officials said. Mexican President Claudia Sheinbaum said all six victims on the plane were from her country.

A spokesperson for Jet Rescue Air Ambulance confirmed the names of the four crew members who were killed in the crash:

• Capt. Alan Alejandro Montoya Perales
• Copilot Josue de Jesus Juarez Juarez
• Dr. Raul Meza Arredondo
• Paramedic Rodrigo Lopez Padilla

The Ensenada municipal government confirmed Valentina Guzmán Murillo was the child receiving treatment and that her mother, Lizeth Murillo Osuna accompanied her.

On Saturday, Mayor Cherelle Parker said during a press conference that one person on the ground who was in a car was killed in the crash. The individual has not been identified.

In an update on Sunday, Parker said 22 people were injured and five of them remain hospitalized. At least 11 homes were significantly damaged, along with some businesses.

The National Transportation Safety Board (NTSB) is leading the investigation with assistance from the Federal Aviation Administration (FAA).

The jet's cockpit voice recorder was recovered at the impact site at a depth of about 8 feet, the NTSB reported in a Sunday update. Also recovered was the aircraft's ground proximity warning system, which could contain flight data.

The plane had reached about 1,500 feet before it plummeted to the ground, NTSB Chairman Jennifer Homendy said. Homendy reported the air ambulance crash was classified as an accident, and that there were no signs that things were going to go wrong.

Officials said a preliminary report would be issued in about 30 days.

The crash came just two days after the deadliest U.S. air disaster in a generation, when an American Airlines jet carrying 60 passengers and four crew members collided in midair in Washington, D.C., with an Army helicopter carrying three soldiers. There were no survivors.

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Editor's note: The Associated Press contributed to this article.