(CNN) — Authorities confirmed there were “multiple casualties” after two planes crashed in mid-air over Watsonville Municipal Airport Thursday afternoon, the city’s Fire Department Division Chief Rudy Lopez told CNN. A single-engine Cessna 152 and a twin-engine Cessna 340 collided during their final descent into the airport, according to a statement from the Federal Aviation Administration (FAA). One person was aboard the Cessna 152 and two people were aboard the Cessna 340, according to the FAA statement. No one was injured on the ground, the FAA added.

Authorities confirmed multiple deaths after two planes collided over a California airport. The report arrived just before 3:00 pm, according to a twitter post of the city, which added that “multiple agencies” were reporting on the incident.

The city of Watsonville is about an hour south of San Jose. Both the FAA and the National Transportation Safety Board (NTSB) are investigating the incident, according to the FAA statement. In a post on Twitter the NTSB confirmed that it was investigating the mid-air collision. It is unclear what caused the two planes to collide.