Police have arrested a seventh person as part of an ongoing investigation into a suspected terror plot.
A 22-year-old woman was detained at a residential address in Hackney, east London, early today.
She was arrested on suspicion of the commission, preparation or instigation of acts of terrorism under the Terrorism Act 2000, a spokesman for the Metropolitan Police said.
The arrest, by officers from the Met's Counter Terrorism Command, follows six others made on Thursday.
The woman is in custody at a south-east London police station.
On Thursday British Muslim convert Richard Dart, 29, was reportedly one of the six people arrested over the suspected terror plot.
Dart, who changed his name to Salahuddin al-Britani after converting, is believed to have been one of three people detained in Ealing, west London, and was arrested in the street.
The others detained in Ealing were a 21-year-old man and a 30-year-old woman held at separate home addresses.
Three men living just over a mile from the Olympic site in Stratford, east London, were also arrested.
The men, aged 18, 24 and 26, who are believed to be members of the same Bangladeshi family, were detained in a raid on their home.
The six, who include a former police community support officer, remain in custody at a south-east London police station on suspicion of the commission, preparation or instigation of acts of terrorism.
Warrants of further detention were granted at Westminster Magistrates' Court yesterday.
The alleged plan involved Islamist extremists with potential targets in the UK, but was not linked to the Olympics, it is understood.
The threat to the UK from international terrorism is currently rated substantial - the third highest of five levels.