A 20-year-old man was charged on Sunday with first-degree assault for last week's shooting of two police officers during a protest in the troubled city Ferguson, Missouri, a crime that fueled a national debate on race and policing.

The suspect, Jeffrey Williams, has admitted to firing the shots and was from the general St. Louis area, St. Louis County Prosecuting Attorney Robert McCulloch, told a news conference.

"It was not certain if he had been targeting police," he added.

The St. Louis suburb has been racked with protests since a white police officer killed unarmed black resident Michael Brown, 18, last summer. The slaying sparked demonstrations around the country and led to a U.S. Justice Department probe.

Williams, an African American who had been on probation for possession of stolen property, was arrested after a massive manhunt. Tips from the public and video evidence helped in the investigation, McCulloch said.

"He has acknowledged his participation in firing the shots," McCulloch said, adding Williams had been at protests in the city.

The suspect, whose bond was set at $300,000, appears to have used a .40 caliber handgun and was firing from a car, McCulloch said, adding it is possible that he was shooting at someone else.

A handgun was recovered in his residence and matched shell casings found at the scene, according to McCulloch, who said although Williams appears to be the only shooter, other people may be charged as the investigation continues.

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