Four men were shot dead in front of a crowd at an amusement park, a toddler died after the car he was traveling in wrecked during a gunbattle, and a businessman was killed after leading a protest against violence, officials said yesterday.In all, 21 people died in 24 hours across Mexico, which is waging a battle against drug traffickers and other criminal gangs.In Ciudad Juarez, the four men were shot inside a go-cart rental at the Xtreme amusement park Wednesday night, said Alejandro Pariente, a spokesman for the local prosecutor.Elsewhere in the city, a used-car salesman was shot to death while driving down a main boulevard hours after leading hundreds of other business owners in a protest against kidnappings and extortion, Pariente said.In Tijuana, a 1-year-old boy was killed when the car he was riding in wrecked as the driver tried to flee a gunfight late Wednesday between police and three armed men, the state prosecutor's office said.

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