The Daytona 24 Hours has been red-flagged shortly before the three-hour mark after a serious incident involving the pole-winning GAINSCO/Bob Stallings entry driven by Memo Gidley.
Gidley was running fourth when he hit the Risi Competizione GT Le Mans class Ferrari of Matteo Malucelli, who is understood to have lost drive.
Gidley and Malucelli were both taken to the local Halifax hospital after being removed from their respective cars.
The safety car was initially deployed and then the race stopped when the extrication of the drivers began.
The race was led overall by Christian Fittipaldi in the Action Express Coyote-Chevrolet Corvette DP by less than a second when the red flags came out.