A federal review of helicopter safety around some of the busiest U.S. airports has revealed dangerous flying conditions at the Las Vegas airport.

A helicopter safety review found dangerous conditions at Harry Reid International Airport in Las Vegas, according to a Tuesday readout from the Federal Aviation Administration (FAA). Acting FAA Administrator Chris Rocheleau referenced the deadly crash in January between an Army Black Hawk helicopter and an American Airlines passenger plane outside of Washington as a justification for conducting analysis on other airports — beginning with Las Vegas — during a roundtable on rotorcraft safety.

The Federal Aviation Administration said on Tuesday it is taking action to prevent collisions between helicopters and passenger planes around the busy Las Vegas airport, citing significant safety issues.