Seven other people were arrested for what included two further public order offences, one breach of Public Order Act conditions and a public order offence, one breach of Public Order Act conditions, one possession of pyrotechnics, one support for a proscribed organisation and one criminal damage.
The Metropolitan Police said a man, aged 79, was detained on suspicion of a public order offence after being seen to make the salute towards a counter-protest organised by Stop The Hate.
The Palestine Solidarity Campaign (PSC), along with demonstrators from five other groups, gathered in Whitehall at noon on Saturday before marching to the US embassy in Nine Elms Lane, south-west London, where speeches were made.
Eight people, including one who appeared to aim a Nazi salute at counter-demonstrators, were arrested on Saturday during a pro-Palestine march through central London.
Protesters marched holding signs and banners that read “Hands off Gaza”, “Stand up to Trump”, and “Mr Trump, Canada is not your 51st state.
