Hundreds of protesters have gathered outside the US Embassy in London to voice their disgust at a grand jury decision not to prosecute the police officer who shot an unarmed black teenager dead in the US.
Michael Brown was killed by officer Darren Wilson in Ferguson, Missouri, who will now face no criminal charges.
More than 1,000 demonstrators chanted "jail racist cops" and "killer police off our streets", holding placards reading “Black lives matter”.
The aunt of Mark Duggan, the black teen shot and killed by police in London, sparking nationwide riots, was also there.
The mother of US teen Michael Brown says comments made by the police officer who killed her son have added "insult after injury".
Lesley McSpadden, Brown's mother, told NBC's Today show that officer Darren Wilson had been "disrespectful" by saying that her son looked like a "demon" before the shooting.
Brown's father, Michael Brown Snr, said Wilson's account of the incident was "crazy".
"Who in their right mind would rush or charge at a police officer that has his gun drawn?" he asked.
A shooting which injured two FBI agents at a house in the north of St Louis County was "not directly related" to the riots in Ferguson, the agency has said.
One agent was shot in the shoulder and the other in the leg while assisting local police in executing an arrest warrant at the house, an FBI spokeswoman said.
Their injuries are not life-threatening.
"The incident is not directly related to the Ferguson protests," the spokeswoman added, but did not elaborate further.
Two FBI agents have been shot at a house in the north of St Louis County, Missouri, local media reported.
It was not immediately clear whether the shootings were linked to the riots in Ferguson.
Forty-four people were arrested during a second, calmer night of protests in Ferguson, Missouri, the St Louis county police chief said.
Police have used tear gas against protesters near the Ferguson city hall as a second night of demonstrations threaten to escalate into violence.
Protesters have set fire to a police car outside the Ferguson city hall building.
Protesters have clashed with police at a rally in New York, as demonstrations against the decision not to charge a police officer who killed a black teenager continue across the US.