Warning: This video is not for the faint of heart.

Even after the race has been won, a professional racetrack can still be incredibly dangerous.

Indonesian racer M Fadli had just finished first in the Sentul leg of the SuperSport 600 cc category in the Asia Road Racing Championship (ARRC) 2015. He appeared to slow down after crossing the finish line to wave to his supporters in the stands.

At the same time, Thai racer Jakkrit Sawangswat came in from behind M Fadli and slammed his motorcycle into the winner’s outstretched left knee.

Both riders appeared to be severely injured after the collision, with Sawangswat looking particularly bad as he shows no signs of movement at the end of the video. They were both taken to the hospital after the accident.

According to Kompas, M Fadli’s left leg required an operation. It’s apparently in such a bad state that it may have to be amputated if conditions worsen. Meanwhile, Sawangswat is reportedly in a coma because of the accident.

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