Protesters block an intersection after an 18-year-old was fatally shot by a policeman in Berkeley, Missouri, Dec. 24, 2014.

In the latest incident to fuel mounting tensions over a spate of police killings, Antonio Martin, a black teenager, was shot dead by a white officer in Berkeley after he allegedly pointed a gun at the officer. The incident took place late December 23rd at a gas station in the town near Ferguson, Mo., where another black teen was shot dead by a white officer last August.

St Louis County Police Chief Jon Belmar said the officer was called to the gas station about a theft and when he arrived two men approached the police car. The suspect then pointed a nine-millimeter pistol at the officer, who drew his own weapon and fired three shots, one fatally striking the suspect.

Police officers attempt to disperse demonstrators during a protest outside the Mobil On-The-Run gas and convenience store in Berkeley, Missouri, on December 24, 2014.

A protester speaks to other demonstrators outside the Mobil On-The-Run gas and convenience store in Berkeley, Missouri, Dec. 24, 2014.

Mayor Theodore Hoskins speaks during a news conference in Berkeley, Missouri, Dec. 24, 2014.

Protesters confront police at an intersection after a man was fatally shot by a policeman in Berkeley, Missouri, Dec. 24, 2014.

Police detain a protester during a demonstration after a man was fatally shot by a policeman, in Berkeley, Missouri, Dec. 24, 2014.

Toni Martin-Green, mother of Antonio Martin, an armed man fatally shot by police late on Tuesday, lights a candle during a vigil for her son in Berkeley, Missouri, Dec. 24, 2014.

Courtney Palmer, cousin of Antonio Martin, an armed man fatally shot by police late on Tuesday, kneels with her family in front of a memorial at the site of the shooting in Berkeley, Missouri, Dec. 24, 2014.

Police stand guard during a protest at Cathedral Basilica in St. Louis after a man was fatally shot by a policeman in the nearby suburb of Berkeley, Missouri, Dec. 25, 2014.

A handgun is pictured that was recovered following the officer involved shooting at the Mobil on the Run gas station in Berkeley, Missouri, Dec. 24, 2014.

Eighteen-year-old Antonio Martin was shot and killed Dec. 23 by a Berkeley police officer after he pulled a gun on the officer, in the St. Louis suburb just two miles from Ferguson.

Following the shooting protesters gathered at the scene and conflicts broke out between officers and protesters.

Police said several explosive devices, possibly fireworks, were thrown after a crowd gathered at a gas station on Dec. 24, 2014, hours after an officer shot and killed an armed 18-year-old man in Berkeley, Missouri.

Surveillance video showing an officer-involved shooting during a routine business check at a gas station in Berkeley, Missouri Dec. 23, 2014 released by the St. Louis County Police Department December 24, 2014.

Large crowds gathered after a man was killed during an officer-involved shooting in Berkeley, Missouri.