Damar Hamlin, a Buffalo Bills football player, allegedly lost consciousness during Monday night's game against the Bengals when his heart stopped beating.
Hamlin was given CPR by the medical team as soon as they arrived on the scene, according to Fox News, before being revived and brought to a Cincinnati hospital in an ambulance. Hamlin is still in serious condition, according to sources.
Fans, pundits, and other players immediately expressed their concern and well wishes in response to the medical emergency, which also served to draw attention to how deadly America's most popular sport is.
Players and spectators at the stadium were seen crying in photos that appeared on social media early on Tuesday morning as medical personnel attempted to resuscitate Hamlin. Later, the game was rescheduled.
According to sources, during the first quarter of Monday night's game, Hamlin was tackled by Bengals player Tee Higgins and suffered a serious chest injury.
After then, he got up and abruptly fell to the ground, prompting medical personnel to rush onto the field.
During the treatment, which according to ESPN included CPR, players from both NFL teams, visibly shocked by what they had seen, crowded around Hamlin. Many of them knelt to pray, and some of them were visibly in tears.
At 1:48am local time the Bills confirmed Hamlin suffered a cardiac arrest following the hit and his heartbeat was restored on the field. He is currently sedated and remains in a critical condition.