Police have imposed restrictions on a pro-Donald Trump rally during the US president's visit to the UK.

Scotland Yard said the Welcome Trump procession was planning to join with a Free Tommy Robinson march, backing the jailed far-right activist.

The Metropolitan Police said the restrictions were because a Robinson rally in London on June 9 caused "serious violence", with bottles and barriers hurled at officers, resulting in five being injured and nine arrests.

The pro-Trump rally will breach the Public Order Act if it does not start at 1pm on Saturday at Temple Place, central London, and follow a route to Whitehall where it must end at 2pm, the Met said.

Protesters who fail to follow the order, which also bans the use of vehicles in the procession, will face arrest and prosecution, the force said.

Chief Superintendent Elaine Van-Orden said: "Our message is simple: if you wish to protest peacefully, that is your right and we want to work with you. If you commit criminal acts or breach the conditions of the event, you are liable to be arrested."

A Unite Against Fascism counter-protest has also had conditions imposed and must assemble south of a police barrier in Parliament Street after noon and finish by 6.30pm.

The restrictions do not apply to a Stand Up To Racism march.

Robinson, a 35-year-old former English Defence League leader, whose real name is Stephen Christopher Yaxley-Lennon, was jailed for 13 months for contempt of court after filming people involved in a criminal trial and broadcasting the footage on social media.