Brazilian police have arrested 10 members of a group initially feared to be members of a so-called Islamic State who were alleged to be preparing acts of terrorism ahead of the Olympic Games.
Officials later released a statement saying they were not members of IS but had tried to make contact with the group.
According to Alexandre Moraes, Brazil’s justice minister, the group he called "absolute amateurs" were "ill-prepared" and was blocked by police in the planning stage of launching an attack.
They were alleged to have contacted a weapons supplier in neighbouring Paraguay to get AK 47 assault but police found no such weapons bought upon their swoop in 10 different states.
The group were said to have used messaging services such as Whatsapp in their communication.
Brazil has called for an emergency meeting of its cabinet and issued a statement that 80,000 police and soldiers will patrol Rio streets for the games which will end on 21 August.
The International Olympic Committee recently concluded that Rio de Janeiro was "ready to welcome the world" to the 2016 Olympics because it had overcome her setbacks.
Rio’s readiness was feared to have delayed because of its state on building delays, the Zika virus and political crises.