Why were the fans of the Netherlands and Sweden detained in the stadium?

Organizers in Houston issued an urgent warning to fans following the Netherlands-Sweden match in the 2026 World Cup, urging them to remain inside the stadium due to sudden weather changes. The warning came after lightning and thunderstorms appeared in the vicinity of the stadium, prompting organizers to immediately activate safety procedures. Messages were broadcast over the stadium's loudspeakers and screens advising fans to wait until the weather improved. The stands, packed with thousands of spectators, were filled with anticipation. Dutch fans took advantage of the victory to celebrate inside the stadium rather than leave, as the weather forecast predicted continued rain after the final whistle, necessitating the temporary stay of fans until the danger passed.