Security Concerns - Rio 2016, London 2012

Authorities have vowed to continue the crackdown and stabilize Rio's security ahead of the 2014 World Cup and the 2016 Olympic Games that Rio will be hosting.

Paulo Storani, a security consultant and former captain in the elite BOPE police unit leading the invasion said, "the pacification of Rocinha means that authorities have closed a security loop around the areas that will host most of the Olympic and World Cup activities".

The Rocinha slum is home to about 100,000 people living in flimsy shacks that has become one of the most lucrative and largest drug distribution points in the city.

Police have also set up roadblocks at the entrances of the slum to capture the slum's drug kingpins.

Meanwhile security is also on the mind of the British government ahead of the London 2012 Summer Games. The government was forced to defend its security plans Monday for the London 2012 Olympics following a report that the United States was set to send its own agents to the London Games.

The Guardian said U.S. officials had raised "repeated concerns" about security and were planning to deploy 1,000 of their own security agents, including 500 from the Federal Bureau of Investigation (FBI) in London.

The newspaper also said the London 2012 Organising Committee had underestimated the number of security staff it would need at the 32 Games venues, with 21,000 guards now required instead of the initial 10,000.

Both the Home Office and the Ministry of Defence are involved in security planning for the Games. A Home Office spokesman said that security planning was "on track" and the International Olympic Committee (IOC) had "full confidence" in the blueprint.

According to London 2012 officials, the venues and competition schedule needed to be completed before they could finalize security plans.

A LOCOG statement said, "since winning the bid a huge amount of collaborative work has been completed. We finalized the competition schedule, with 650 sporting sessions over 18 days, built and selected over 100 competition and non-competition venues, and designed the transport and accommodation plans. This all needs to be in place before the detailed security plans could be confirmed".