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Al Qaeda's powerful Syrian branch, the Nusra Front, announced on Thursday it was ending its relationship with the global jihadist network founded by Osama bin Laden, to remove a pretext used by world powers to attack Syrians.The announcement came as Russia and President Bashar al-Assad's government declared a "humanitarian operation" in the besieged rebel-held sector of Aleppo, opening "safe corridors" so people can flee Syria's most important opposition stronghold.Washington said that appeared to be an attempt to depopulate the city and make fighters surrender. The opposition called it a euphemism for forced displacement.In the first known video statement ever to show his face, the leader of the Nusra Front, Mohamad al-Golani, announced that the group would re-form under a new name, with "no ties with any foreign party".

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The state of Rio de Janeiro will deploy nearly 14,000 security officers -- about a third more than previously planned -- during the coming Olympic and Paralympic Games, Military Police General Commander Edison Duarte said Monday.Authorities plan to deploy more officers to the Barra da Tijuca area -- the neighborhood where the Olympic Park, Athletes Village and most of the Olympic sporting arenas are located.The contingent will be part of the 85,000 security officers that have been deployed to the city. In addition to Rio's state police, members of the Brazilian Armed Forces, navy and out of state police will be on patrol throughout the city.Duarte also announced more than 3,000 vehicles would be used for policing during the Games, as well as three blimps spread throughout the city that will transmit high resolution images in real time.

Over the weekend, the rebels tried to reconnect an encircled area in the east with insurgent territory in the west.They set off a huge tunnel bomb underneath army positions in the strategic Ramouseh district.The army has been fighting back with the help of Russian air strikes to stop the rebels breaking through.Around a quarter of a million civilians are living under siege in rebel-held areas since government forces cut them off last month.Aleppo was once Syria's commercial capital and also boasted a rich architectural and archaeological heritage.Much of it has been destroyed or looted during more than five years of war.

Riot Control Fence - The Best Way to Control CrowdWith just days to go before the Olympics start in Rio de Janeiro, Brazilian security forces have shifted their gaze to an even more amorphous crime: terrorism.They have increased checks at this border post - where tens of thousands of people cross back and forth every day - and have set up a control room with access to dozens of cameras watching different points of the frontier.Intelligence officials have long pointed to this border region, home to a sizable Muslim community, as a weak point in Brazilian security.With an estimated 500,000 foreigners descending on Rio for the Olympics and recent attacks on European cities raising security concerns, the daunting task of monitoring and controlling the border area between Brazil, Paraguay and Argentina has come back into focus.It is often the most crowded crowd wherever Olympic is taking place. The riot control fence, as the name suggests, it is designed to control riot and crowd

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The 31st summer Olympic Games, also known as the 2016 Olympic Games in Rio de Janeiro, on August 5, 2016-21st in Brazil Rio de Janeiro. Rio de Janeiro will be the first South American city to host the Olympic Games in the history of the Olympic Games, but also the first Olympics Portugal language city; in addition, the summer Olympics after the 2014 World Cup and Brazil sports event. Whether it is a normal stadium or common stadium, there is a safe and effective fence is very important. 358 anti-climb fence is also called 358 mesh fence, or prison fence. It is usually installed with concertina razor wire coils or barbed wire on its top. This type is especially used for prison and military bases.

Over the past few weeks, IS in Europe launched a series of deadly attacks: since the July 14 Bastille Day manufacture large-scale terrorist attacks in Nice, Germany four consecutive terrorist attacks. Well-known US anti-terrorism monitoring website "Intel Center" Statistics say that from the beginning of this year, June 8, in addition to Syria and Iraq theater, every 84 hours will be associated with the IS attack.

The United States has carried out air strikes on positions of so-called Islamic State (IS) in Libya, following a request by the UN-backed government there, the Pentagon says.The strikes targeted positions in the port city of Sirte, an IS stronghold.Libyan PM Fayez Sarraj, in a televised address, said the strikes caused "heavy losses".Western powers have become increasingly concerned at IS's growing presence in Libya.The air strikes are the first such US military intervention co-ordinated with the Libyan unity government.There have been two previous US attacks on IS targets in Libya - last February and in November.

Worried about possible terrorist attacks at the Olympics in Rio de Janeiro, Brazil’s government is working closely with American law enforcement and intelligence services to identify threats and thwart potential disasters at the Games.Despite its notorious battles with violent crime, Brazil has largely been spared the kind of brazen terror attacks that have rattled much of the world in recent years, with Brazilian officials long playing down the nation’s vulnerability to homegrown extremism.But jihadists are calling for mayhem at the Olympics, building on a wave of killings in Europe, the United States and elsewhere over the last year, including the massacre of 130 people in Paris and “lone wolf” attacks inspired by the Islamic State, that has raised broad fears about Brazil’s security preparations for the Games.