Besieged Hong Kong police officers drew their side arms on protesters, with one of them firing a warning shot into the air as they were pushed back by thick crowds of stick-wielding demonstrators.

The gunshot incident was apparently the first of its kind since the protests began in early June. It came amid a night of violent protests that saw activists hurling gasoline bombs and paving stones and smashing shop windows.

A massive raft made of pumice stones is floating towards Australia, carrying marine organisms that scientists say could help replenish Australia's Great Barrier Reef.

Some of the stones are as large as basketballs, and have formed a giant sheet stretching about 58 square miles — nearly the size of Washington, D.C.

An explosion from an underwater volcano near the tiny island nation of Tonga is thought to have produced the raft, according to NASA.

President Trump is meeting with his counterparts at the G-7 summit in France, where he walked back previous statements on trade with China.

On Friday, Trump hiked tariffs on Chinese imports and threatened to invoke a 1977 act authorizing the president emergency powers to force U.S. businesses out of China.

Updated at 11:45 a.m. ET

Joe Walsh, a conservative talk-radio host and former Tea Party congressman, is launching a long-shot primary challenge to President Trump. He's the second Republican to officially announce a run against Trump, who has a strong approval rating among his party's base.

Walsh, 57, supported Trump during his 2016 campaign but in recent months has been offering a bitter critique of the president, calling Trump a liar and bully who is unfit for office. Walsh has also attacked Trump from the right.

Everyone knows what a trumpet looks like: shiny brass. But the Instrument of Hope is mostly black.

Except for the lead pipe — the straight part that extends from the mouthpiece.

It's made of bullets.

"Bullets that were shot and fired out of a gun, cut up and pieced together," says Josh Landress, who made it.

The protests that have rocked Hong Kong for much of the past three months have followed familiar patterns.

First, hundreds of thousands of people, including families with babies in strollers, pack the city streets. Then the sun goes down, the families head home, and the young men and women in black come out. They come ready to confront the "popo," as they call the police.

Tucked away in the northwest corner of Wyoming is one of the largest gun collections in the world: The Cody Firearms Museum. But it's recently gotten a makeover, moving away away from being a monument to guns and toward being an educational space on gun safety, history and culture.

The museum is located at the Buffalo Bill Center of the West alongside four other museums and near the east entrance to Yellowstone National Park. So often, people just happen upon it. That was the case for Kim Cato and her family, visiting from Idaho.