Travel advice to Britons for Brazil was updated yesterday as fresh protests broke out in the country’s largest city, Sao Paulo.
Riot police were called as more than 50,000 people gathered for a march through the city.
Shops and banks were vandalised by groups of masked activists, who fought other demonstrators trying to stop the violence, the BBC reported.
The protests began earlier this month, with demonstrators calling for a 10% hike in bus fares to be revoked.
But they have since grown into a nationwide movement calling for better education, schools and transport.
Many demonstrators have complained of the huge sums spent on construction for next year’s World Cup and the 2016 Olympic Games, which will be hosted by Rio de Janeiro.
The Foreign & Commonwealth Office highlighted protests in a number of Brazilian cities, including Rio de Janeiro, Sao Paulo and Belo Horizonte.
“Some of these have turned violent,” the FCO said. “You should avoid all protests and demonstrations. Monitor local media, follow the guidance of the local authorities and expect some disruption to travel.
“If you intend to visit a British Consulate, please check before travelling as some opening hours have been disrupted.
“Levels of crime and violence are high, particularly in major cities. You should be particularly vigilant before and during the festive and Carnival periods. Bank card fraud is common.”