- Two middle-aged adults and three teenagers arrested by Scotland Yard
- They are being questioned on suspicion of possessing information which could help terrorists
- One of the girls was first arrested last month at the age of just 15
Five members of a single family, including three teenage girls, were today arrested on suspicion of terror offences in east London.
A man and a woman in their 50s were arrested along with two girls aged 16 and 17, and a 19-year-old woman.
The youngest girl was first arrested last month, when she was just 15 - making her the youngest UK female terror suspect ever.
All five family members - believed to be a father, mother and their three daughters - are currently being questioned by officers at a London police station.
The Metropolitan Police said in a statement: 'Officers from the Met's Counter Terrorism Command attended an address in east London on Wednesday, August 12, and arrested five members of the same family.
'Officers arrested a 51-year-old man, a 53-year-old woman and three females - a 16-year-old, a 17-year old and a 19-year old.
'All five were arrested on suspicion of possessing information likely to be useful to a person committing or preparing an act of terrorism.
'The man was additionally arrested on suspicion of possessing false identity documents with improper intention, contrary to Section 4 of the Identity Documents Act 2010.
'All five currently remain in police custody in a central London police station.
'These arrests are part of an ongoing investigation which previously saw one of the females arrested on 2 July on suspicion of preparation of terrorism. She is, at present, on police bail to a date in September pending further enquiries in relation to that matter.'
Dozens of Britons have been arrested on suspicion of terror offences in the past few months after a spate of young men and women travelling to Syria to fight for ISIS.
Last month, a 15-year-old boy from Blackburn, Lancashire pleading guilty to encouraging Australian jihadists to murder soldiers during Anzac Day celebrations.