1928 Italian Grand Prix

It was run over 60 laps, and was won by Louis Chiron driving a Bugatti 37A.

This race was also the VI Grand Prix d'Europe.

[1] This race was marred by the death of at least 22 spectators as well as driver Emilio Materassi on lap 17, when Materassi lost control of his car on the main straight at over 200 km/h while trying to overtake Giulio Foresti.

The car swerved to the left of the track, bounced over a three-meter deep and four-meter wide protection ditch and a fence and crashed into the grandstand, killing him along with 22 spectators.

[3] By either estimation this is the worst accident, with respect to the number of lives lost, to occur at a Grand Prix, and the second-deadliest in motor racing history, being surpassed by the 1955 Le Mans disaster.

The fatal accident of Emilio Materassi during the race.