Town hall estimates some 40,000 people, including many tourists, took part in Wednesday's hour-long street bombardment, which has its roots in a food fight among kids back in 1945.
Participants - many wearing T-shirts, shorts and goggles - flopped around in the swamp of red pulp while they pelted each other with tomatoes dumped on them from five loaded trucks.
Portable showers were set up so revelers could shower afterward.
The town's streets and walls are hosed down once the battle ends.
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