A police officer in Ferguson, Missouri, is "fighting for his life" after being critically injured in an assault outside the city’s police station during protests on the 10th anniversary of the fatal shooting of Michael Brown, the city’s police chief said Saturday.

Protesters were peaceful for most of Friday night, and police allowed them to block streets outside the station, Ferguson police chief Troy Doyle told reporters. Police also didn’t intervene when protesters began shaking a fence outside the station.

But Doyle said that when protesters broke the fence, destroying property on police grounds, he sent out an arrest team, which included Officer Travis Brown, who is Black. 

Doyle said that a suspect charged Travis Brown, knocking the officer to the ground. Travis Brown suffered a severe brain injury after hitting his head in the fall.

MINNESOTA RIOTS CONTINUED AFTER WALZ TOOK ‘RESPONSIBILITY TO ENSURE’ THERE WOULDN'T BE CHAOS

Police Chief Troy Doyle

Police Chief Troy Doyle said Officer Travis Brown "wanted to be part of the change" in the Ferguson community. Now, the officer is "fighting for his life." (AP Photo/Jim Salter)

"He is in an area hospital right now fighting for his life," Doyle said of the officer.

Doyle said Travis Brown started with the department in January and previously worked for the St. Louis County Police Department. He is part of a wave of Black officers hired into the department since 2014. Back then, there were just three Black officers in the department, but Black officers now make up more than half of the police force, Doyle said.

"He wanted to be part of the change," Doyle said. "He wanted to make an impact in our community. He’s the type of officer that we want in our community. And what happens? He gets assaulted. I had to look his mother in the eye and tell her what happened to her son. I’m never going to do that again, I promise you that."

PENNSYLVANIA OFFICER AT TRUMP ASSASSINATION ATTEMPT SAYS HE NEEDS ‘EMPIRE’ AMID SECRET SERVICE STAFFING WOES

St. Louis County prosecutor Wesley Bell also met with the officer’s family.

"I always talk about you know the toughest part of this job is when we have a family that’s lost a loved one that we can’t bring justice to," Bell said. "And I’ve got to tweak that. The toughest thing I’ve had to do is talk and console with a mother who doesn’t know if her child is doing to make it. And for what?"

A memorial to Michael Brown

A memorial to Michael Brown is displayed on Canfield Drive in Ferguson on Aug. 7. A Ferguson police officer was critically injured in protests on the 10th anniversary of Michael Brown's death on Friday. (AP Photo/Jim Salter)

Two other officers also were hurt, one sustaining an ankle injury and another an abrasion. Both were treated at the scene.

One of the suspects was charged Saturday with assault of a special victim, resisting arrest and property damage. He was ordered to be held on $500,000 cash only bond.

Bell said others also would be charged.

Michael Brown’s death led to massive demonstrations that helped to solidify the Black Lives Matter movement in Ferguson, Missouri, and around the country.

CLICK TO GET THE FOX NEWS APP

In 2015, the Justice Department declined to charge Darren Wilson, the officer who shot Michael Brown, but released a highly critical report that noted racial bias in the Ferguson police department and the county courts.

The Associated Press contributed to this report.