A white off-duty policeman shot and killed a black teenager in St Louis on Wednesday, officers said, triggering a night of protests just miles from the site of another police shooting of another black youth in the suburb of Ferguson.
Police said the 18-year-old was armed and fired three shots while he was being chased by the officer, and they had recovered a gun at the scene.
The youth was killed almost two months to the day since sometimes violent protests erupted in Ferguson after a white police officer shot dead unarmed black 18-year-old Michael Brown.
