Thousands of protesters will descend on central London this weekend for several demonstrations linked to the ongoing war in Iran.
The biggest event is expected to be a Stop the War demonstration against the US and Israeli strikes later today.
Crowds of demonstrators will march from Russell Square near the British Museum to Richmond Terrace, Whitehall, where speeches will take place.
The Met said the assembly in Richmond Terrace must finish at 6pm and any speeches and amplified music must stop at 5.30pm.
Meanwhile, a separate Stage for Freedom demonstration against the Iranian government will march from Hyde Park Corner in Knightsbridge to the Iranian embassy near Hyde Park.
The force said the assembly at the embassy must conclude at 5pm.
Scotland Yard has imposed strict conditions on the demonstrations.
It has banned the use of amplified sound equipment for music or speech, or any other item to create noise, including musical instruments, sound‑emitting devices, or items struck or banged together.
Superintendent Neil Holyoak, who is in charge of policing London this weekend, said: ‘Officers will be on duty this weekend to police these events and ensure they pass off safely and peacefully.
‘As always, we will not hesitate to act if we see criminality.
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‘We have imposed conditions, chiefly to minimise noise and disruption to local residents based on extensive feedback.
‘Those who refuse to comply with the conditions risk being arrested.
‘We will also not tolerate people setting off fireworks which we have seen in recent weeks.
‘Please ensure if you are planning to attend this weekend’s events you act within the law and respect surrounding residents and businesses.’
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