The St. Louis police chief says nine people have been arrested and officers have used tear gas to clear a street amid protests after an armed 18-year-old was fatally shot by police.

Police Chief Sam Dotson said at a news conference late Wednesday night that protesters who were blocking a street also threw glass bottles and bricks at officers.

Dotson says the protesters ignored requests to clear the road and inert smoke was deployed.

He says that had no effect, so police then used tear gas after giving warnings over a loudspeaker.

Dotson says a car was set on fire nearby and police were responding to reports of burglaries in the area.

Dotson says nine people were arrested during the protests over the police killing.

The chief said earlier that the 18-year-old was fatally shot after he pointed a handgun at officers.