FERGUSON, Mo. >> A diverse group of protesters, many of them children, marched peacefully Saturday as calm prevailed for a fourth straight day in the St. Louis suburb where an unarmed black 18-year-old was shot by a white police officer, setting off more than a week of unrest.

Several community activists walked side-by-side with police officers in uniform as they walked down one of the main streets in Ferguson that had been filled with armored vehicles and officers in riot gear less than a week ago.

“I think some of the frustration is dying down because more information is coming out,” said Alana Ramey, 25, a St. Louis resident who joined the afternoon march. “I think there is more action going on. People are being more organized and that is helping.”

The images of well-armed suburban police officers confronting protesters in Ferguson with tear gas and rubber bullets after the Aug. 9 shooting of Michael Brown by Ferguson Officer Darren Wilson prompted widespread criticism of how local law enforcement agencies have used federal grants to obtain military gear from the Pentagon.

President Barack Obama ordered the White House to conduct a review of those programs after calling for more separation between the nation’s armed forces and civilian police.

The federal government also has launched its own investigation into the shooting, sending dozens of FBI agents to Ferguson to question witnesses. St. Louis prosecutors have convened a grand jury to begin hearing evidence in the case and to decide whether to indict Wilson in the shooting.

About 10 miles south of Ferguson, supporters of Wilson rallied at a sports pub owned by the family of Mark Rodebaugh, a 21-year veteran of the St. Louis police department. Rodebaugh said he wanted to have the event because Wilson’s name has been “dragged through the mud.” He said it felt good to see supporters who weren’t either officers themselves or relatives of officers.

“We’ve got a hard job to do,” he said. “We want people to know they shouldn’t give up on law enforcement.”

Wilson has not spoken publicly since the shooting. He has been on paid administrative leave and Associated Press reporters have not been able to contact him.

Earlier Saturday, Normandy High School, which Brown attended, observed a moment of silence for him at the start of a home football game.

“This is something we shouldn’t forget,” said Donald Vaughan Cross, 77, a Hanley Hills resident whose grandson played for opposing team, Lift for Life Academy Charter. “This is something that should be on the minds of everybody — young ones and old ones. And the old ones like myself, we remember. It’s still going on. When is it going to stop? When is it going to end?”

Burnett reported from St. Louis.