It comes as more than 200 people have been arrested in central London at the largest demonstration relating to Palestine Action since the group was proscribed as a terrorist organisation.
Hundreds of people gathered in Parliament Square for a demonstration organised by the campaign group Defend Our Juries, who said “approximately 1,000 sign-holders” had turned up.
The government outlawed Palestine Action last month under terrorism laws, with membership carrying a maximum sentence of 14 years in prison.
Home Secretary Yvette Cooper said violence and criminal damage had no place in legitimate protest, and Palestine Action’s activities, including breaking into an RAF base and spraying two aircraft with red paint, justified the ban.
Palestine Action has increasingly targeted Israel-linked companies in Britain.
It accuses the government of complicity in Israeli war crimes and genocide in Gaza.
Derry IPSC (Ireland Palestine Solidarity Campaign) said some of its activists had letters hand-delivered from the PSNI on Friday evening.
That came ahead of a protest in Guildhall Square to ‘lift the ban on Palestine Action’, where a group of protestors again defied the ban by holding signs that read: “I oppose genocide. I support Palestine Action.”
They included at least one of the Bloody Sunday families, while civil rights veteran Eamonn McCann was also in attendance.
The PSNI said it has “grounds to suspect they have committed offences contrary to Section 13 of the Terrorism Act 2000” during the “Defend the Right to Protest” protests on July 19 and 26.
Derry IPSC added: “We wonder how many such notices have been given to all those carrying UVF flags in recent weeks.
“We won’t be intimidated or dissuaded, they cannot arrest us all, we are all Palestine action!
“This hand delivered on a Friday night before our protest tomorrow clearly suggests they want to put people off joining us tomorrow, an obvious attempt at intimidation.”
Protestors defy the ban against support for Palestine Action at the Guildhall in Derry on Saturday.
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A letter from the PSNI shows that the accused were invited to respond to an email address to arrange an interview as “a voluntary attendee”.
It adds: “Failure to make contact with the police to arrange a suitable date for interview, within ten days of receipt of this letter, may result in you being reported to the Public Prosecution Service without the opportunity to provide your account.”
This follows People Before Profit councillor in Derry, Shaun Harkin, being charged by the Public Prosecution Service for participating in a pro-Palestine protest.
Shaun informed the PSNI he would not be accepting a PPS caution for participating in a Derry City Centre protest on the 17 February 2024 because he “did nothing wrong and was prepared to go to court to prove this”.
Mr Harkin said: “The people of Gaza are being starved to death and pushed into a Rafah concentration camp.
“Every action to stop the Gaza genocide is an act for humanity against barbarism.
“The PPS and the PSNI should be focused on identifying those in Westminster and Stormont who have incited support for Israel as it carries out war crimes and government bodies providing funding for business organisations to make parts for F-35 murder jets that are being used to kill tens of thousands of Palestinian children.
“Israel’s supporters have lost all legitimacy. They can no longer defend or hide the barbarism they support, so they are trying to silence the mass global movement opposed to genocide.”