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US police have clashed with protesters in St Louis after an officer shot dead a black teenager near where Michael Brown was killed in August, a death that triggered national protests, the BBC reported.

A crowd of about 100 people gathered at the scene early on Wednesday following scuffles the night before.

St Louis County police said the man who was shot had pulled a gun at a petrol station and pointed it at the officer.

For weeks there have been protests about alleged police brutality.

Berkeley is about two miles from the suburb of Ferguson, where the 18-year-old Brown was shot dead by a white officer.

The victim of the Berkeley shooting was named by local media as Antonio Martin, 18, citing his mother.

Police spokesman Sgt Brian Schellman said that an officer had been conducting a routine check at a petrol station in North Hanley Road on Tuesday evening when he saw two men and approached them.

He said that one of the men pointed a handgun at the officer.

"Fearing for his life, the Berkeley officer fired several shots, striking the subject, fatally wounding him," he said.