The National Transportation Safety Board (NTSB) on Tuesday issued two “urgent” safety recommendations after discovering thousands of close calls between helicopters and planes near Ronald Reagan Washington National Airport following a midair collision in January.

A medical transport helicopter crashed Monday in Mississippi, while carrying two hospital workers and a pilot, officials said.

A medical helicopter crash in Madison County, Miss., on Monday, March 10, has claimed the lives of all three people on board. The University of Mississippi Medical Center (UMMC) identified the deceased as Dustin Pope, 35, of Philadelphia, Miss.; Jakob Kindt, 37, of Tupelo, Miss.; and Cal Wesolowski, 62, of Starkville, Miss., on Tuesday, March 11.