Five members of the same family have been arrested by counter-terrorism police in east London, Scotland Yard has said.
The five – a 51-year-old man, a 53-year-old woman, and girls aged 16, 17 and 19 – were held on suspicion of “possessing information likely to be useful to a person committing or preparing an act of terrorism”.
The man was also accused of possessing false identity documents “with improper intention”.
They are all in custody at a central London police station.
It is understood the investigation that led to the arrests is linked to Syria and potential plans to travel to the country.
The officers who attended the address were not armed.
The arrests are part of an ongoing inquiry which saw a 16-year-old girl arrested last month on suspicion of preparation of terrorism.
She is on police bail until September as inquiries continue.