Scotland Yard said a number of people were arrested at the Heathrow incident, while West Midlands Police said four women and one man were arrested on suspicion of obstructing the highway and failing to comply with section 14 of the public order Act on the A45 in Solihull.

A spokesman for Nottinghamshire Police said screens erected at the scene of the protest were to prevent distraction for motorists.

Screens were also at the scene of the Heathrow incident, where video footage appeared to show a number of police officers moving the protesters while they continued to lie on the road.

The day of action comes just a day after the anniversary of Mr Duggan's death. An inquest jury decided that Mr Duggan was lawfully killed by a police marksman.

BLMUK describes itself as a network of anti-racist activists from across the UK.

The group said: "We stand in solidarity with the families and friends of all who have died at the hands of the British state. We take action because justice has not been delivered through conventional means: the police, the IPCC, the courts or the legislature."

The campaigners said they aim to highlight "the struggle for black lives in the UK and £Shutdown state-sanctioned racialised sexism, Islamophobia, classism, ableism, homophobia and transphobia", adding: "We fight for liberation."