- Protesters angered by last week's decision by a grand jury not to indict a white police officer who killed an unarmed black teenager have lain down in front of the Justice Department headquarters in Washington.

The protest against the grand jury decision in Ferguson, Missouri, was expected to continue with a rally later Monday afternoon at the Justice Department.

Earlier Monday, protesters lay in the middle of the roadway on the 14th Street Bridge, one of the main routes into Washington from Virginia. It was the third straight day that protesters had blocked traffic in the nation's capital.

They carried signs that read "Black lives matter" and "accountability for killer cops."

The protest took place at 12:01 p.m. Central time — the time Brown was killed on Aug. 9 — with events planned in more than 30 cities in the U.S. and abroad, activists said.

“From the #ShutItDown actions that have blocked major highways and intersections to the #BlackOutBlackFriday protests, the message is clear: No more business as usual,” Ferguson Action, an organization formed after Brown’s death to demand justice, wrote on its website.

“We can no longer do what we have always done and cooperate with a system that does not respect black lives,” the organization wrote. “We will only get the change we want if we disrupt the daily order and insist that black lives matter. If that means shutting down the entire country, that’s what we’ll do.”

High school students from Ferguson to Los Angeles participated in the actions, with some holding signs reading ‘No more killer cops!’ and ‘I wish I lived in a country where Tamir Rice could have turned turned 13.’ Rice was shot and killed by a police officer in Cleveland Nov. 22 after the officer mistook Rice’s toy gun for a real weapon.