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Ted S. Warren, Associated Press
A protester holds a sign Thursday, May 21, 2015, during a rally at a park in Olympia, Wash. Two stepbrothers suspected of trying to steal beer were shot Thursday by a police officer in Olympia. The officer reported he was being assaulted with a skateboard early Thursday before the shooting that left a 21-year-old man critically injured and a 24-year-old man in stable condition. Both are expected to survive.

OLYMPIA, Wash. — Hundreds of people marched peacefully in Washington state's capital city to protest a police shooting that wounded two unarmed stepbrothers suspected of trying to steal beer from a grocery store.

The officer reported he was being assaulted with a skateboard early Thursday before the shooting that left 21-year-old Bryson Chaplin in serious condition and 24-year-old Andre Thompson in stable condition. Both were expected to survive.

Protesters rallied at a park Thursday, then marched about a mile to a building that houses police headquarters and City Hall, holding signs that read "Race is a Factor" and "We Are Grieving." The crowd chanted "Black Lives Matter," ''No Justice, No Peace" and the names of the young men who were shot.

The stepbrothers are black, and the officer is white, but Olympia Police Chief Ronnie Roberts said, "There's no indication to me that race was a factor in this case at all."

Bryson Chaplin was in intensive care but upgraded from critical to serious condition, hospital officials said Friday. He and his stepbrother weren't armed with guns, according to investigators.

"It was terrible," the men's mother, Crystal Chaplin, told Seattle news station KIRO-TV. "It's heartbreaking to see two of my babies in the hospital over something stupid."

The shooting is being investigated by a team of detectives from several agencies. Brad Watkins, chief deputy of the Thurston County Sheriff's Department, said two skateboards were recovered from the shooting scene and an investigation will likely take three to six weeks.

Officer Ryan Donald was among those who responded around 1 a.m. Thursday to a call from a Safeway store, Roberts said. Employees said two men tried to steal beer and then threw the alcohol at workers who confronted the pair.

Officers split up to search for the men. Donald encountered two men with skateboards who fit witnesses' descriptions, and moments later, he radioed in that shots had been fired, the police chief said.

In radio calls released by police, Donald calls dispatchers once he spots the men, and again to report that he fired shots.

"I believe one of them is hit, both of them are running," Donald said.

He tells dispatchers that one of the men "assaulted me with his skateboard."

"I tried to grab his friend," Donald said. "They're very aggressive, just so you know."

He says he has one man, then both, at gunpoint and asks for help.

Seconds later, he shouts, "Shots fired! One down," and asks for more backup units. He then says the second man has been shot.

The police chief said Donald wasn't injured but an officer "has the right to defend himself" if a suspect wields an object that could be used as a deadly weapon.

Donald, 35, who is on administrative leave pending the investigation, has been with the department for just over three years. No residents have filed complaints against him, and he was recently recognized by the agency for being proactive on investigations, Roberts said. He worked previously as an Army police officer, the chief said.

The shooting follows a string of high-profile police killings of unarmed black men, including Michael Brown in Ferguson, Missouri, and Eric Garner in New York City, which set off weeks of protests and a national "Black Lives Matter" movement that has gained momentum across the country.

Olympia Mayor Stephen H. Buxbaum called for calm in the community.

"It deeply saddens me that we have two young people in the hospital as a result of an altercation with an officer of the law," he said. "Let's come together to support their needs, the officer's needs, the needs of the families and our community's needs. Let's not be reactive."

Merritt Long, a retired chairman of the state's liquor control board, attended a Thursday news conference about the case and wondered if the shooting was justified.

"Given the seeming epidemic of this happening not only here but in our country, it makes you pause and wonder what's going on," he said.