An estimated 30,000 fans packed San Pedro Square for Mexico's World Cup win Thursday — more than the city expected — forcing a halftime lockdown of the main plaza and sending fans onto parking garage rooftops and the street. San Jose organizers say they are now considering closing additional blocks for future matches.

The main plaza at San Pedro Square was full before Mexico scored.

By the time security officials closed access to the central viewing area Thursday night — before the halftime whistle, with Mexico leading 1-0 over South Korea — an estimated 30,000 fans had packed the square, far outrunning the 25,000-plus the city had prepared for. Police were out in force. The crowd kept finding the edges.

Some climbed to the upper levels of a nearby parking garage and watched from above. One group, cut off from the plaza, went a different direction entirely: they DoorDash'd a television, a power inverter, and an extension cable, then set up on the street to stream Mexico's win — which made El Tri the first team to advance to the tournament's Round of 32 — from the sidewalk.

"It was crazy, I didn't think it was going to be this busy," Victoria, a San Jose resident, told NBC Bay Area. "But it was really fun."

For the block around San Pedro Square, the match revealed something about the physics of putting 30,000 people somewhere that wasn't quite designed for it. San Jose organizers responded this week by saying they are considering closing additional streets for upcoming watch parties — an expansion of the footprint that the crowd, in effect, had already demanded before anyone asked.

Across the bay, thousands of fans filled Thrive City Plaza outside Chase Center in San Francisco for a free outdoor screening, watching behind a march of Mexican banda players and six lowrider cars led by Mayor Daniel Lurie. That plaza hit capacity too, leaving hundreds cheering from outside the gates.

Among them was Andrew Choi, who came wearing South Korean colors and found himself absorbed into the celebration anyway. "It's so supportive, no hate at all, just love," he told NBC Bay Area. Esteban Diaz, who had traveled from Guadalajara to watch a future match at Levi's Stadium in Santa Clara, said the local turnout caught him off guard. "I am proud for this, I was expecting a much smaller crowd."

Chase Center officials announced after Thursday's event that they will expand the Thrive City schedule for future tournament matches through July 19.

At San Pedro Square, organizers have not yet named which streets might close. But the crowd already drew the boundary: the upper deck of the parking garage was where the plaza ended, and where Thursday's match was settled.