Footage on social media showed the moment the church roof caved in, puffs of grey smoke billowing into the air, followed by the toppling of yellow brick outer walls.
The Greek earned his 10th career crown and extended his perfect ATP head-to-head record against de Minaur to 10-0.
Neither Mexico's National Immigration Institute nor the Chihuahua state prosecutor's office has responded to confirmation requests.
The three countries won the right to host the World Cup in a united North American bid.
The Chihuahua state prosecutor said in a statement that among those who died in the prison attack were 10 security personnel and four inmates.
'I am responsible for this disappointment. It is a great sadness and I assume all the responsibility of this huge failure,' said Martino, whose contract was reportedly due to expire after Mexico's World Cup campaign.
Mexico finished with four points, level with Poland who lost 2-0 to group winners Argentina and had a superior goal difference of one to advance.
The Argentina team did not immediately respond to a request for comment about Alvarez's statement.
After two rounds, Mexico are bottom of Group C with just one point.
Poland lead the group with four points from two matches followed by Argentina and Saudi (three).