( CNN ) -- Just 12 miles south of the spot where a police officer killed Michael Brown , it happened again : Another 18-year-old died at the hands of police Wednesday . An off-duty officer opened fire on the teen , and the policeman did n't stop until he 'd fired his weapon 17 times , authorities say . Anger erupted among residents , who damaged police cars , and they pointed to what they felt were parallels to the Brown shooting . But in reality , the similarities are slim . Yes , the teen was black . And the officer was white . Yes , the officer fired several times . And it all unfolded in the St. Louis metro area . But the commonalities end there . In this case , the 18-year-old was armed , and he fired on the officer first , St. Louis Police Chief Sam Dotson said . The death comes on the heels of the Brown shooting two months ago in the suburb of Ferguson , and just ahead of a `` Weekend of Resistance '' in St. Louis , where activists will push for movement in the investigation into that case . Tensions are already high in the community , and it 's uncertain how the latest shooting will affect its mood . `` At the scene of yet another young man 's death , '' tweeted St. Louis Alderman Antonio French . `` This happens too often in our city . It 's a crisis that we should all be concerned about . '' An animated crowd quickly gathered late Wednesday near the site close to the Missouri Botanical Garden , chanting slogans as St. Louis police officers stood by . `` Hey , hey , ho , ho , these killer cops have got to go , '' the crowd chanted , repurposing a popular chant from the Brown protests . The confrontations with police were intense and laced with profanity . `` That was somebody 's baby , '' screamed one man , referring to the man who was killed . `` Think about your own child , '' pleaded another person in the crowd . Despite the tensions , Dotson said no businesses were looted and no windows were smashed . He praised officers for showing a `` tremendous amount of restraint '' as members of the crowd confronted them face-to-face and damaged police cruisers . Complete coverage of Ferguson . The officer , a six-year veteran of the force , was working a second job for a security company , one that was approved by his department . He was wearing his police uniform . While on patrol , the officer saw three black males run away as he approached . He gave chase because one of them was holding up his pants in a way that made the officer believe the teen may be carrying a gun , Dotson said . The officer and one of the three tussled . The teen ran off , then turned around and fired at least three shots at the officer , Dotson said . The officer returned fire , killing the teen . Police recovered a 9 mm handgun . And Dotson said the teen was `` no stranger to law enforcement . '' He did n't offer details , citing privacy concerns . The two other males have not been apprehended . In August , the death of the unarmed Brown fueled protests and sparked a nationwide debate on police use of force . Protesters are planning a series of demonstrations , rallies and events in Ferguson and St. Louis this weekend to call for an end to racial profiling and what they call police violence . This weekend 's protests start with a rally outside the office of the prosecutor investigating the Brown shooting . Demonstrators will call for Bob McCulloch to step aside and allow a special prosecutor to be appointed . Additional marches and demonstrations will mark the weekend , along with `` civil disobedience actions around the St. Louis region , '' according to a statement from organizers that also says thousands of people from across the country are expected . CNN 's Dave Alsup , Tony Marco and Dana Ford contributed to this report .
Police : Police fired at least 17 shots , the suspect at least two . The suspect was not injured ; a gun was found . An investigation is underway . Events are planned this weekend in Ferguson and Saint Louis .