The State Department is warning Americans traveling to Russia for the World Cup that terrorists could target the games or related venues during the month-long tournament, though it has not mentioned any specific threats.
The department issued a travel advisory on Friday urging Americans to "reconsider travel to Russia due to terrorism and harassment."
"Although security for the World Cup will be extensive, terrorists may seek to attack event locations such as stadiums and Fan Fest viewing areas, tourist sites, transportation hubs, and other public venues," it states.
The State Department's advisory also notes that assistance to U.S. citizens from American consulate services could be "unreasonably" delayed by Russian authorities.
"Due to the Russian government-imposed reduction on U.S. diplomatic personnel in Russia, the U.S. government has reduced ability to provide services to U.S. citizens," the department wrote.
Russia faces unrest in the North Ossetia and Chechnya regions, among others, according to the advisory.
The travel advisory was issued two days after it was announced that the U.S., Canada and Mexico had jointly won a bid to host the 2026 World Cup.
President Trump had lobbied for the bid on his Twitter account and during a press conference with Nigerian President Muhammadu Buhari in April.
"The U.S., together with Mexico and Canada, just got the World Cup," Trump tweeted on Wednesday. "Congratulations - a great deal of hard work!
This year's World Cup in Russia kicked off Thursday and is slated to go until July 15.