RIO DE JANEIRO (AP) — The Latest on the 2016 Summer Olympics in Rio de Janeiro (all times local):

6:25 a.m.

Polish media are reporting the head of the Polish Weightlifting Federation is stepping down after two athletes have tested positive for using illegal substances.

The federation head, Szymon Kolecki, has announced he will step down on Aug. 16, according to the state-run news agency PAP.

The announcement comes after Polish weightlifter Tomasz Zielinski was banned from competing at the Rio Olympics and sent home because he tested positive for a banned substance.

In announcing his resignation, Kolecki said a second weightlifter, Krzysztof Szramiak, had tested positive for an above-normal level of growth hormone. Szramiak did not make the 2016 Polish Olympic team.

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5:25 a.m.

A retired U.S. Air Force captain who now covers women's basketball says an Olympic media bus in Rio de Janeiro was hit by gunfire en route from a venue.

Britain's Press Association on Wednesday quoted Lee Michaelson, who was on the bus Tuesday, as saying that she instinctively hit the floor when she heard the sound of gunfire and "hollered to the others ... 'Get down! Get down! We are taking fire.'"

Michaelson says "I know what a gun sounds like. There was a very distinctive sound of the report of a gun. It was the sound before I ever saw the glass (shatter) or anything."

Police are investigating but Olympic officials say it's not clear whether the incident was caused by bullets or stones.

Michaelson says both the bus driver and Olympic officials sorely lacked training. The driver slowed down and pulled over, which she says is "precisely the opposite of what he should have done, which was to put the gas on and floor it."

When they returned to the Olympic park, she says there was no medical help waiting, despite some passengers being injured and bleeding.

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5 a.m.

Host nation Brazil must play big or go home Wednesday when its men's soccer team takes on Denmark — for the country scarred by a 2014 World Cup debacle is facing another possible embarrassing elimination at home.

The team has had two deeply disappointing scoreless draws in this Olympic tournament — to South Africa and Iraq, not exactly world soccer powerhouses — and fans have been booing and mocking the team, especially superstar Neymar.

Brazil coach Rogerio Micale has leapt to the defense of his misfiring 24-year-old star striker, who has been criticized for poor performances and a lack of leadership.

The coach says "Neymar will become the best player in the world, we need to respect him ... He is young. I know that at times he behaves in a way that we may not like, but at his age, wouldn't we do the same things that he does?"

Micale said the criticism could hurt future generations of Brazilian players who dream of being on the national soccer team.

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5 a.m.

All eyes will be on Japan's Kohei Uchimura as the men's individual all-around gymnastics final takes place on Wednesday.

That's because Uchimura won the worlds in 2013, 2014 and 2015 and is the defending gold medalist from the 2012 games in London.

He starts on the floor exercise and comes to the event with a gold in hand from the men's team finals on Monday.

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5 a.m.

Olympic cyclists are surely hoping that the treacherous Grumari circuit at the Rio de Janeiro games does not claim any more victims.

British cyclist Chris Froome, who is coming off his third Tour de France victory in four years, goes last as the men's individual time trial takes place Wednesday. The race will be run on the same hilly, winding Grumari circuit that produced a number of crashes in both the men's and the women's Olympic road races.

Defending gold medalist Kristin Armstrong of the United States is going last Wednesday in the women's individual cycling time trial, but Anna van der Breggen of the Netherlands will be eager to follow her Rio Olympic road race gold with another medal. Dutch teammate Ellen van Dijk is also a strong contender.

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AP Summer Games website: http://summergames.ap.org