low flying helicopter causes freak crash on stage 4 of Giro d’Italia
 

Vini Zabu-KTM's Wackermann and Etienne van Empel both fell in the incident. "Wackermann was sent to the hospital, he was barely conscious," team boss Andrea Citracca told Italian TV station RAI2. "The helicopter was flying too low, the movement of the air blew up the barriers. It is not clear if he has broken his pelvis. The barriers were not tied properly."

https://www.bbc.com/sport/cycling/54441571