Emergency teams tended to three unconscious people at different locations around Paseo de la Reforma, authorities said. The capital's most emblematic boulevard and the streets around it had been closed to traffic and set up for the soccer celebrations.

"After receiving advanced resuscitation efforts, the deaths of a 44-year-old man and a 19-year-old woman from suffocation have been confirmed," the health authority initially said on social media.

The third fatality was a 48-year-old woman who was treated on a nearby street after suffering asphyxiation and died after being taken to hospital, the secretariat added in a later post.