Michael brown
More racial unrest in St. Louis after police kill black suspect
Police fatally shot a black teenager on Wednesday after he allegedly pointed a gun at them.
Police say the video shows Tyrone Harris drawing a pistol from his pants.
Authorities in Ferguson have declared a state of emergency following violent protests.
The emergency order was issued after officers shot & wounded an 18-year-old man in an exchange of gunfire.
A year ago the police shooting of an unarmed black teen thrust Ferguson into the international spotlight.
A Chicago art exhibit stirred controversy with a life-size silicone replica of slain Michael Brown.
Obama said it was important for police to recognise that some have a problem in how they deal with criminals.
The officers were shot and wounded during a demonstration in the St. Louis suburb.
Several dozen protesters had gathered in front of the Ferguson police department earlier on Wednesday night.
Organisers said the marches were among the largest in the recent wave of protests against the killings.
US Attorney-General Eric Holder has now promised a full probe into the case.
Protests are taking place after a grand jury’s decision not to indict a white cop in the death of a black man.
Protests also dwindled in the US as Thanksgiving holiday and wintry weather kept many indoors.
St. Louis police said three people were arrested at a protest near City Hall on Wednesday.
One agent was shot in the shoulder and the other was shot in the leg while assisting local police.
Officer Darren Wilson has broken his silence and said he shot Michael Brown in self defence.
Flights over the area were restricted and police struggled to contain protesters who took to the streets.
Violence broke out after a grand jury said the policeman who shot Michael Brown dead, would not be charged.
Friends and family celebrated the life of the 17-year-old killed by a police officer.