Our reporter Nick Ravenscroft reports from Rio de Janeiro which has seen rioting just 50 days before the tournament starts.
Thousands of revellers have joined in the fun at the annual carnival in Rio de Janeiro.
A new dance craze dubbed 'little step' is sweeping Brazil's capital and, some believe, is helping to tackle drug and crime problems.
Protesters and police have clashed again near Copacabana beach in Brazil after demonstrators returned from the graveside of a man allegedly shot by the police this week in a nearby favela.
Stun grenades and tear gas in Copacabana. Demo returned from the grave of the man who died this week in favela. Met by big police presence.
Police with gas masks and guns for firing cannisters http://t.co/xZ68SdIPwV
Defensive police lines in Copacabana http://t.co/a4V06iBpKv
A Rio de Janeiro slum near the Copacabana beach has erupted in violence following the killing of a popular local figure, with residents starting fires and hurling home-made explosives and bottles in the city's main tourist zone.
ITV News Brazil correspondent Nick Ravenscroft reports:
According to news website G1, the man was mistaken as a drug dealer. The area is currently on lockdown by police.
Thousands of England fans are expected to travel to Rio in June and July, where the national team will be based during the 2014 World Cup.
The International Olympic Committee has sent a clear warning to the organisers of the Rio 2016 Games that "every second counts" after visiting the Brazilian city.
With just over two years to go, the IOC said that a "constant, concerted and integrated effort is required for the successful delivery of the Games and its legacy".
It added: "Although progress is being made, each decision that is postponed and each subsequent delay will have a negative impact on delivery. Total focus and dedication are therefore required."
ITV News' Brazil correspondent Nick Ravenscroft, who was at the news conference, tweeted:
IOC presser re Rio 2016. Time + again say they have been "given assurances" that problems and delays in preparations will be resolved (1/2)
Scepticism from assembled hacks. These sound v much like assurances given re preparations for World Cup. And that's dangerously late. (2/2)
Masked demonstrators broke storefront windows and hurled petrol bombs in Rio de Janeiro last night after a protest by striking teachers turned violent.
The protest started out peacefully with at least 10,000 demonstrators occupying one of Rio's major downtown boulevards.
Teachers have been on strike for better pay, but protesters were also angry at what they see as excessive use of police force on demonstrating teachers a week ago.
Protests took place in dozens of Brazilian cities on Saturday over government corruption, the poor quality of public services, the hosting of the current Conferations Cup and next year's 2014 FIFA World Cup in Brazil.
Protesters trying to reach the Maracana stadium in Rio de Janeiro were fought back with tear gas last night amid some of the largest demonstrations seen in the city for two decades.
Police were prepared for potential disturbances at the stadium, which is hosting the Confederations Cup ahead of the World Cup next year.
Brazilian protesters descended on the National Congress building in the capital Rio de Janeiro last night although there were no reports of serious damage.
Photographs showed scores of protesters on the roof of the building at one stage and police had to use a fire extinguisher to put out a small fire on a window frame.
Police eventually managed to negotiate with protesters to leave the premises, it was reported.