UK warns citizens about a high terrorism threat in Brazil. Travelers urged to avoid crowded areas amid warnings that attacks may target places frequented by foreigners. The Foreign, Commonwealth & Development Office advises vigilance and staying informed via local news. If visiting Brazil, be cautious around major sites and avoid certain Amazonas river areas. British nationals should steer clear of political rallies, which could quickly turn violent. Stay safe and informed, folks. Keep those fins—er, eyes—peeled!