Police have arrested 10 pro-Palestinian demonstrators taking part in the rally in central London today.
One person was arrested before the march kicked off on suspicion of support for a banned organisation.
Scotland Yard said the arrest had been made “on suspicion of support for a proscribed organisation in relation to a placard” before the march kicked off from Marble Arch at 1.30pm.
A further nine were then arrested shortly after following an incident at Hyde Park Corner.
10 people have been arrested by the Met Police as demonstrators march towards the Israeli embassy
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One was a man who was seen in the crowd with an antisemitic placard.
When officers tried to arrest him, they were assaulted, which led to the arrest of six others for assaulting an emergency worker, according to the Met.
Two others were arrested for refusing to remove face coverings when asked to do so by police officers.
Between 200,000 and 250,000 had signed up for the march calling for a ceasefire in Gaza, a spokesperson for the Palestine Solidarity Campaign said.
Over 200,000 people had signed up to take part
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Former Labour Party leader Jeremy Corbyn is part of the 'hundreds of thousands' demonstrating
PA
Around 1,500 police officers from forces across the UK are on duty on the streets of London.Police pushed for the start time, which would allow for a synagogue event to finish before the rally began.
Organisers had initially advertised a kick-off time of 12.30pm before the Met Police intervened, the Campaign Against Antisemitism stated.
Just before 1.00pm today, the force posted on social media, saying: “The march is forming up at the south of Park Lane. It will not set off until 1.30pm.
“There has been one arrest so far on suspicion of support for a proscribed organisation in relation to a placard.”
Later today, speakers will address crowds near the Israeli embassy.
The police have said they must stop by 5.00pm, while protesters must leave by 6.00pm.