Four people died during massive celebrations in downtown Mexico City following the national team's victory over Ecuador, Mexican health authorities said Wednesday.
Mexico defeated Ecuador 2-0 on Tuesday night to break a 40-year drought without a win in the knockout stage and progressed to the World Cup round of 16.
Mexico took advantage of a defensive blunder by South Korea to win 1-0 and become the first team to advance to the knockout stage of the World Cup.
Mexican authorities are investigating how a corpse ended up outside a stadium in the border city of Tijuana, where Iran's national team has been training for its upcoming World Cup match against New Zealand.
An independent search is underway for Nancy Guthrie's remains near the border following an anonymous tip about the whereabouts of her body, though authorities say there is no evidence to verify the claim.