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

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.

The Federal Aviation Administration says analysis in the wake of January’s crash between an Army helicopter and a passenger jet landing at Ronald Reagan Washington National Airport and has identified other airports where the risks of similar collisions are too high.