Brazilian police held a simulated exercise ahead of the Olympic Games in 2016.

SOUNDBITE (French) Anne-Christine Ponchon, French police lieutenant:

"We are showing and teaching our techniques to the Brazilian police. We show them our way of working and afterwards they use them or they don't use the techniques that we use in France and in Europe. Every year there's a specific theme. Last year we were preparing for the World Cup and now the Olympic Games."

SOUNDBITE (French) Anne-Christine Ponchon, French police lieutenant:

"Brazil is not a country under threat by Daesh or Islamic State which mainly affect the United States and France but with a big world event like the Olympic Games where there will be delegations from different countries and heads of states, it will be necessary to be very, very careful."

SOUNDBITE (Portuguese) Andre Silva, commander of the Rio de Janeiro's riot police squad:

" (The events) happening in other places make us alert and to observe more, to think and train for a possible ( event like in Paris)"