The United States triumphed on the pitch over longtime political adversary Iran on Tuesday in a World Cup match overshadowed by protests raging in Iran and laced with decades of tension between the two countries.

The contest in Qatar between the two nations, which severed diplomatic ties more than 40 years ago, took place under increased security to prevent a flare-up over the anti-government protests across Iran since the death in custody of 22-year-old Kurdish woman Mahsa Amini on Sept. 16.

Qatar, which has strong ties with Washington and friendly relations with Tehran, has staked its reputation on delivering a smooth World Cup, beefing up security at Iran games and banning some items deemed inflammatory, such as Iran's pre-1979 Islamic revolution flag.