Thousands of pro-Palestine protesters gathered in Parliament Square to call for a ceasefire between Israel and Hamas.
The protesters marched from Bank Junction to Westminster, with many holding signs with the words “Free Palestine” and “End the siege”.
Some protesters chanted: “One, two, three, four, occupation no more, five, six, seven, eight, Israel is a terrorist state.”
They also chanted the controversial slogan: “From the river to the sea, Palestine will be free.”
It comes after the UK chose to abstain on a United Nations Security Council resolution demanding an immediate humanitarian ceasefire in Gaza – a motion that was vetoed by the US.
Lebanese-American Nadim Hussami, 44, said that the Government should demand a ceasefire.
“They should ask for an immediate ceasefire and not veto or abstain from UN Security Council resolutions,” he said.
Jocelyn Cruywagen, from South Africa, said that no-one can be free until Palestinians are free.
“We were oppressed by white people, as black South Africans we had to fight for our freedoms, we are still not entirely free,” she said.
“It takes so much time.
“The words of Mandela are, if the Palestinians are not free, we cannot be free, the world can not be be free.”
She said that the Government must call for a “permanent ceasefire”.
“They should ask for the land to be restored to the Palestinians,” she said.
“The wall needs to come down.”
Londoner Kelly Hunter, 60, said she felt “helpless” watching the news.
“I have come on every single one, I am a Londoner,” she said.
“I feel helpless, I can’t sleep at night.
“I am watching this genocide. I will do everything I can in my power to march against it.”
Previous weekends have seen thousands of protesters and counter-protesters converging on the capital.
The Metropolitan Police tweeted that a man had been arrested on suspicion of a racially aggravated public order offence.
“As the march formed up, officers identified a man with a placard making comparisons between Israel and Nazi Germany,” the force said.
“He has been arrested on suspicion of a racially aggravated public order offence.”
While a further arrest was later made for an offensive placard, the force said.
Earlier, the Met Police said that protesters must stick to the agreed route, under Section 12 of the Public Order Act.
“Further conditions are in place that mean speeches must end by 4pm and the assembly at the end of the protest must end by 5pm,” it said.
