Four people were injured when a medical helicopter crashed on a highway in Chicago, Illinois, on Saturday night, with one in critical condition, officials said.
The pilot made a “mayday” radio call from a Eurocopter 135 air ambulance at about 9:15 p.m. Central Time (0215 GMT Sunday), according to a Federal Aviation Authority statement. The helicopter crashed on a ramp of the Interstate 57 highway soon after, it said.
