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Thousands of people marched through central London on Wednesday night in protest at the decision not to prosecute an American police officer who shot dead a black teenager.

Crowds of protesters were seen holding placards as they walked through central London to show their anger over the killing of 18-year-old Michael Brown in Ferguson, Missouri.

They joined a gathering of people holding a vigil for the teenager outside the US Embassy.

The families of Mark Duggan and Sean Rigg also joined the protest, according to reports.

Father-of-six Mr Duggan was shot dead by a police marksman in Tottenham in 2011, while musician Mr Rigg died after being restrained at Brixton police station in August 2008.

According to Russia Today, Mr Duggan's aunt Carol told protesters: “Murder is not legitimate. No one should lose their child. Michael Brown has not got justice neither has Mark Duggan. The police are there to protect, not to kill our children."

Police in Missouri have revealed that police officer Darren Wilson will not face charges for the killing of Mr Brown on August 9, but campaigners claim he should be tried for murder.

The move sparked riots in the St Louis suburb on Monday and widespread unrest across the US.

Moving to Leicester Square now. Hands up don't shoot is echoing around. #LondonToFerguson pic.twitter.com/kJ9SrbkG3W — Michael Segalov (@MikeSegalov) November 26, 2014

This week Mr Wilson defended his decision to shoot the unarmed teenager when he stopped him on suspicion of theft, saying Brown punched him in the face after trapping him in his police car.