The Games start on Aug 5 and are expected to attract as many as 500,000 foreign visitors. The source said that federal police had arrested members of a group that was preparing acts of terrorism. Briefcase 1 Brazilian police arrest members of a group preparing acts of terror. ALSO READ:Brazil probes Olympics threats after group backs Islamic State Brazil's federal police began an anti-terrorism operation early Thursday, just over two weeks before the Olympics start in Rio de Janeiro, a justice ministry source told Reuters.

Source: India Today July 21, 2016 14:51 UTC