Pro-Palestinian rallies are taking place across various locations in Britain, including the capital, London, and the city of Manchester.
In London, thousands gathered outside the British Broadcasting Corporation (BBC) building, with over 1000 police officers deployed.
Police cautioned that anyone showing support for Hamas - listed as a terrorist organization by the British government - or deviating from the prescribed route may face arrest.
This comes a week after the Islamic resistance movement, Hamas, launched an unprecedented attack on Israel.
Armed fighters from the Palestinian movement infiltrated settlements near Gaza, resulting in the deaths of at least 1300 Israelis, with dozens held as hostages and prisoners.
Israel also killed over 2200 individuals in sustained aerial strikes on the Gaza Strip. It is anticipated that the Israeli military will launch a ground assault on the region.
During a massive demonstration organized by the Solidarity with Palestine campaign, protesters waved Palestinian flags and held signs in support of the Palestinians. The crowd chanted as they marched towards Downing Street, the seat of the British government.
One protester, named Mike from Northwest London, told the British news agency "Press Association": "The injustice in the situation is abundantly clear."
The capital's police stated that specific areas in central London fall under Section AA60 of the Criminal Justice and Public Order Act, which requires individuals to remove items such as masks that could be used to conceal their identity, until 22:00 BST.
Marches are being held in several British cities, including Liverpool, Bristol, Cambridge, Norwich, Coventry, Edinburgh, and Swansea.
The protests in London began at the BBC headquarters in central London, and the building was subjected to vandalism during the night, with its entrance splattered with red paint.
A spokesperson for the capital's police said: "We are aware of the criminal damage that has been caused to the building."
They added: "At this stage, there is nothing to suggest that this is linked to any protest group."
Deputy Assistant Commissioner of Police, Lawrence Taylor, stated in a press conference on Friday that there has been a "huge increase" in anti-Semitic incidents in London since the Hamas attacks.
British Prime Minister, Rishi Sunak, described this rise as "disgusting" and emphasized that acts of terrorism or threats "will be met with the full force of the law."
He stated that Israel "has every right to defend itself" from Hamas attacks, but emphasized that the safety of civilians should be a "priority in our minds."
Orli Goldschmidt, spokesperson for the Israeli Embassy in Britain, stated that Israel does not target civilians. However, she told Times Radio: "There will be innocent people tragically losing their lives, but this is a state of war, and we have to prevent anyone from harming us again."
She continued: "We have no animosity towards the Palestinian people. We are trying to protect ourselves from the savage organization of Hamas, which is exactly like ISIS, if not worse."
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