Police and protesters clash for another night in St. Louis after a white off duty police officer killed a black teenager earlier in the week.<br/> <br />As many as 400 demonstrators walked through the streets carrying signs and shouting slogans.<br/> <br />The protests erupted after the shooting death of an 18 year old black male on Wednesday.<br/> <br />Police say the teen fired a weapon at the officer first, but his family disputes that.<br/> <br />The St. Louis area is bracing for more unrest this weekend with demonstrations and marches planned over the August killing of unarmed black teenager Michael Brown in nearby Ferguson.
