The Spanish motor racing driver Fernando Alonso is to have further medical tests after being released from hospital following a precautionary check on his back.
A medical alarm was triggered in Alonso's Ferrari when it crashed down after hitting kerbs at more than 240 kmph during the Abu Dhabi Formula One Grand Prix.
Alonso says he's still suffering discomfort in his back.
Alonso's manager is refusing to say whether the double world champion had concerns about being fit enough to take part in the next round of the championship, the US Grand Prix in Texas in just under a fortnight.
The sensors in Alonso's car measured the impact at 28G when the car landed after taking off over kerbs as he ran off the track avoiding the Toro Rosso of Jean-Eric Vergne.
The alarm is triggered when it exceeds a G-force of 18, and means the driver must go to the medical centre for a check-up.