Mexican President Andres Manuel Lopez Obrador said he “sends a hug to family members, friends of the victims and political supporters”.
Condolences poured in from across Mexico, including by other presidential candidates.
In a video message, Nuevo Leon Governor Samuel Garcia, a leading member of Maynez’s Citizens Movement party, asked residents to shelter in their houses for the next two hours.
Maynez wrote in his social media accounts that he went to a hospital after the accident in the wealthy suburb of San Pedro Garza Garcia, near the city of Monterrey.
He said he was in good condition.
“The only important thing at this point is to care for the victims of the accident,” he wrote.
Videos of the accident showed Maynez waving his arm as the crowd chanted his name.
But then he looked up to see a giant screen and metal structure toppling toward him.
He ran rapidly toward the back of the stage to avoid the falling structure, which appeared to consist of relatively light framework pieces as well as what appeared to be a screen with the party’s logo and theatre-style lights.
Maynez has been running third in polls in the presidential race, trailing both front-runner Claudia Sheinbaum of the ruling Morena Party and opposition coalition candidate Xochitl Galvez.
Both sent their condolences, and Sheinbaum cancelled a campaign event in nearby Monterrey the next day “in solidarity” with victims and their loved ones.
“My condolences and prayers with the families of the dead, and my wishes for a speedy recovery to all those injured,” wrote Galvez in a social media post.
The accident happened at the height of campaign season, with many events held this week and next in anticipation of the June 2 presidential, state and municipal elections.
The campaign has so far been plagued by the killings of about two dozen candidates for local offices.
But it has not been marred by campaign accidents.
- AP