A man has been arrested over chants allegedly supporting Hamas during a protest in north London on Friday.
The 27-year-old was arrested on Friday after a video circulated online showing a man allegedly shouting through a megaphone at a pro-Palestine demonstration in Swiss Cottage.
The suspect, who remains in police custody, was first held on suspicion of inciting racial hatred and then "further arrested" on Sunday on suspicion of inviting support for a proscribed organisation under the Terrorism Act 2000, the force said.
The UK government has designated Hamas as a terrorist organisation.
Among the chants heard in the video were "I love the 7th October" and "I love an organisation that starts with H".
This appears to be a reference to the Hamas attack on Israel last year which killed about 1,200 people with 240 people taken hostage.