A Brazilian policeman, who was working security at the Rio Olympics, has died after being shot in the head when he and two other officers got lost near a slum and came under fire.
Helio Vieira died late on Thursday after the truck he and his fellow officers were travelling in was sprayed with bullets which shattered the windows.
They had been using a GPS device to navigate unfamiliar streets on Wednesday afternoon when they took a wrong turn off a highway leading to Rio's international airport.
Justice Minister Alexandre de Moraes announced Mr Vieira's death on his official Facebook page. The other officers suffered minor injuries.
More than 85,000 security forces have been deployed in Rio for the Olympics, which is double the number of London in 2012.
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Bomb specialists in Brazil have detonated an unattended backpack that was found near the finishing line of the men's cycling race in Rio de Janeiro.
Officials believe that the bag may have belonged to a homeless man, but security protocols say that any unattended objects must be destroyed.
In recent days, there have been several incidents of unattended bags being detonated out in Rio, as the city is on high alert around the Games.
Organisers behind the Rio Games have apologised to spectators who are having to endure queuing in long lines to get access to the Olympic Park on the first full day of the Olympics.
Organising committee spokesman Mario Andrada said that "we obviously need to upgrade" the systems, and have asked security to speed up bag checks.
On Saturday, he said: "We apologise to everyone who is standing in the sun in lines outside the venues... we need to fix this in the next couple of hours."
There have also been reports of official buses getting lost, and Mr Andrada said that organisers would check to see if drivers had been trained sufficiently.
But, he said: "We don't have major structural problems with transport."
Team GB diver Tom Daley tweeted a picture of his family ahead of his first event at the Rio Games.
Posting a selfie with his mother Debbie, partner Dustin Lance Black and other members of his family, he said: "So nice to have my family here to support me. Their support enabled me to get to where I am today. Forever grateful."
The 2012 bronze medallist is to compete in the Men's Synchronized 10m platform on Monday.
So nice to have my family here to support me. Their support enabled me to get to where I am today. Forever grateful❤ https://t.co/zzxTGetBTY
On Friday night, he posted a picture of himself with other members of Team GB ahead of the opening ceremony.
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The Olympic flame has been lit in the Maracana stadium, marking the official opening of the Rio Olympics.
Celebrated Brazilian runner Vanderlei Cordeiro de Lima carried the flame the final steps to the cauldron.
Michel Temer, Brazil's interim-president, has opened the Olympic Games, but was loudly jeered by some in the audience.
He spoke only briefly before declaring the Games open, initiating a fireworks display.
Mr Temer became the country's acting president after Dilma Rousseff was suspended awaiting a trial by the Senate.
Ms Rousseff did not attend the ceremony.
The refugee team, representing the 65 million displaced people around the world, have entered the Maracana stadium.
The team of 10 athletes was greeted with huge applause from onlookers.
The Rio Olympics is the first time a refugee team has competed in the Games