FIFA World Cup

The study, by researchers at Imperial College London, included 142 former players aged between 30 and 60 and compared them to 56 similarly aged healthy people with no history of contact sports.

No official cause of death was released. "The South African Football Players Union (SAFPU) is devastated by the untimely passing of Mamelodi Sundowns and Bafana Bafana midfielder Jayden Adams.

"We played like heroes, but Israel - meaning FIFA and the referees - had something to say about it, and we couldn't overcome these circumstances," said Egyptian commentator Mohammed Nour.

"In today’s media climate, the individualists with the most Instagram likes are celebrated, while players who know how to connect with their teammates are left to the soccer nerds."

The unprecedented move has thrust FIFA's disciplinary process into the global spotlight and prompted an angry response from Belgium, which plays the US on Monday for a place in the quarter-finals.

The robot, presented by tournament sponsor Hyundai Motor, has previously danced and engaged in parkour.

The US received a major World Cup boost after FIFA ruled Folarin Balogun eligible to face Belgium, suspending the immediate enforcement of his red card suspension.

Large crowds have gathered to watch matches near Mexico City's "Angel of Independence" monument, including Tuesday, when four people died from either asphyxiation or cardiac arrest.

“My heart and soul are with them,” he said post-game. “May God have mercy on their martyrs. I dedicate this victory to the Egyptian people and to the Palestinian people, the good and noble people."

"The situation was resolved on scene, and DPD met with representatives of the team to address their concerns," the Dallas Police Department said in a statement.