The number of people arrested after a protest in London on Saturday supporting banned group Palestine Action has risen to 532, police have said.
Around half of them (259) were aged 60 and above – including almost 100 people who were in their 70s.
Some 522 arrests were for displaying a placard in support of a proscribed organisation contrary to Section 13 of the Terrorism Act 2000, according to the Metropolitan Police.
As of 9pm on Saturday, the number was put at 466.
Membership of, or support for, Palestine Action is a criminal offence punishable by up to 14 years in prison under the Terrorism Act.
One of the arrests took place as the Palestine Coalition march formed in Russell Square, while 521 were at the protest in Parliament Square.
Of those arrested, the biggest number (147) was in the 60-69 age group, while 97 people were aged between 70 and 79, and 15 others were between 80-89.
Six were aged 17-19, sixty-five were in the 20-29 age group, 55 were aged 30-39, 45 were aged 40-49 and 89 were in the 50-59 age group.
The average age of those arrested was 54, while some 263 of those arrested were male, 261 were female and eight either defined themselves as non-binary or did not disclose their gender.
Among the arrests, six were for assaults on officers (none were seriously injured), one was for “obstructing a constable in the execution of his/her duty”, two were for breaching Section 14 Public Order Act conditions, and one was for a racially aggravated public order offence.
Hundreds of people attended Saturday’s demonstration in Parliament Square, organised by Defend Our Juries, with the Metropolitan Police warning it would arrest anyone expressing support for Palestine Action.
Anyone who was arrested as part of the operation was taken to one of two prisoner processing points in the Westminster area.
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Those whose details could be confirmed were released on bail to appear at a police station at a future date. They were given conditions not to attend future demonstrations related to Palestine Action.
Those who refused to provide their details at the prisoner processing points and those who were found to have been arrested while already on bail, were taken to one of a number of Met Police custody suites.
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Charity Amnesty International described the mass arrests under UK terrorism law as “deeply concerning”.
The crowd, sat on the grass inside Parliament Square, could be seen writing “I oppose genocide, I support Palestine Action” on white placards at 1pm, with the vast majority remaining silent.
Meanwhile on Sunday, hundreds of people joined a march on Downing Street to urge the release of those being held in Gaza by Palestinian militant group Hamas.
A scuffle broke out after at least two men shouted “Free Palestine” in front of the march.
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One man was seen being bundled to the ground close to Trafalgar Square after being surrounded by around a dozen people.
Another man was seen being moved away by police officers after he began shouting.
