Formula One points leader Max Verstappen left the track early with his Red Bull machine smoking, while Aston Martin’s Fernando Alonso had the fastest lap Friday in the second free practice at the Canadian Grand Prix.

After Circuit Gilles Villeneuve was hit by heavy rain, lightning and hail before the first practice session, Verstappen returned to the garage four laps into the second session after a run on dry tires. Red Bull said the smoke was caused by a battery issue.