On 17 September 2016, during the men's C4-5 road cycling event, Iranian cyclist Bahman Golbarnejhad crashed on a "mountainous stretch" of the circuit in Grumari; after being treated on site for head injuries, he suffered a cardiac arrest during ambulance transport. Golbarnejhad died at Unimed Rio hospital after another cardiac arrest. This marked the first instance of a death in Paralympic competition, and the first death in an Olympic or Paralympic competition since that of Danish cyclist Knud Enemark Jensen at a time trial in the 1960 Summer Olympics.