Buffalo Bills safety Damar Hamlin is in critical condition after experiencing cardiac arrest during a game.

Damar Hamlin collapsed unconscious during the Buffalo Bills NFL showdown against the Cincinnati Bengals after tackling a Bengals receiver in what looked like a standard play. 

Players from both teams surrounded him while Hamlin was administered CPR, in an attempt to give him privacy from the TV coverage of the incident and the stadium crowd.   

US correspondent Richard Arnold says Damar Hamlin is still on a ventilator in hospital and the NFL has since postponed the game.

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