An off-duty St. Louis police officer shot and killed an 18-year-old African American man on Wednesday, prompting overnight protests in the streets of south St. Louis, just a few miles from Ferguson, where unarmed black teenager Michael Brown was killed by a white police officer in August.Details of the shooting remained unclear on Thursday. In a briefing early Thursday morning, Police Chief Sam Dotson said the man fired three shots at the officer first. The white officer, a six-year veteran of the department who was unharmed in the incident, fired his gun 17 times.But relatives of the man, who identified him as Vonderrit Myers Jr., said he didn\u0026#039;t have a weapon.\u0022He was unarmed,\u0022 Teyonna Myers, Vonderrit\u0026#039;s cousin, told the St. Louis Dispatch. \u0022He had a sandwich in his hand, and they thought it was a gun. It’s like Michael Brown all over again.\u0022Jackie Williams, his uncle, called his nephew\u0026#039;s death \u0022outright murder.\u0022The Justice for Mike Brown Coalition held a mid-morning press conference on Thursday, in which State Senator Jamilah Nasheed reportedly said the shooting was \u0022racial profiling gone bad\u0022 and that Myers was shot in the back of the head.\u0026nbsp;The Washington Post reports:According to police, the officer was working for a private security company at the time, patrolling a specific neighborhood, but was in a St. Louis police uniform when he encountered three men he thought were acting suspiciously about\u0026nbsp;7:30 p.m. Wednesday. When they saw the officer make a U-turn, they fled....[The officer] drove through the streets after them and then left his car and chased them on foot. One of the men then turned toward the officer and approached him \u0022in an aggressive manner,\u0022 Dotson said. The suspect and the officer got into a physical altercation.Dotson said the man\u0026nbsp;then ran up a hill and fired three times at the officer before the officer returned fire. Investigators recovered a 9mm Ruger at the scene, which Dotson said was used by the 18-year-old, whom he described as \u0022no stranger to law enforcement.\u0022According to the St. Louis Dispatch: \u0022Myers was scheduled to stand trial in November for unlawful use of a weapon and resisting arrest.\u0022A tense crowd of about 300 gathered in the streets late on Wednesday, chanting \u0022Hey, hey, ho, ho, these killer cops have got to go\u0022—a popular chant from the Michael Brown protests in nearby Ferguson—and \u0022Black lives matter.\u0022 Several police vehicles were damaged during the demonstrations.On Twitter, St. Louis Alderman Antonio French said he was \u0022[a]t the scene of yet another young man\u0026#039;s death. This happens too often in our city. It\u0026#039;s a crisis that we should all be concerned about.\u0022Last night again highlighted the broken trust between community and police in St. Louis. This is a dangerous situation for our city.— Antonio French (@AntonioFrench) October 9, 2014A \u0022weekend of resistance\u0022 against police violence is scheduled to begin tomorrow in Ferguson, featuring marches, meetings, and workshops.