A 20-year-old woman has been arrested on suspicion of encouraging support for proscribed terrorist group Daesh.
The woman was arrested at a property in Lambeth on Tuesday as part of an investigation by Counter Terrorism Policing London into social media posts, Met Police say.
Officers from the investigation team also carried out a search at the premises.
The woman was arrested under Section 12 (1) of the Terrorism Act 2000 on suspicion of encouraging others to support proscribed organisation Daesh, also known as Islamic State or ISIS.
She has since been released on bail to a date in April.
Commander Dominic Murphy, head of Counter Terrorism Policing London, said: "We have been clear for some time that anyone in the UK sharing or promoting terrorist-related material online will be investigated.
"This case also reflects the trend we are seeing of more and more children and young adults being arrested as part of counter terrorism investigations.
“This is a real concern, but friends and families can play a part by looking out for loved ones if they’re worried about someone.
“If you have any concerns about somebody who might be starting on a path towards radicalisation, then I’d urge you to visit our ACT Early website and get in touch before it may be too late.”
Anyone who is concerned about a friend or family member who they think is at risk of radicalisation, can visit www.actearly.ukfor further advice and support, or they can call the ACT Early Support Line on 0800 011 3764 to speak with a specially trained officer.
