Suspect, 17, allegedly received weapons training and instruction from militant in Syria. The girl has been charged with colluding with ISIS to plan a terror attack in the UK.
The teenager, who cannot be named because of her age, is accused of communicating with an Isis fighter based in Syria and arranging to receive weapons to be used in the planned attack.
A spokesperson for the Metropolitan Police said she was also suspected of “receiving instructions on how to train and use weapons” and “reached out to another” for assistance in executing the plan.
She is in custody ahead of a scheduled appearance at Westminster Magistrates’ Court later today.
The girl was previously charged with terror offences in April and is due to appear at the Old Bailey on Thursday in relation to these matters.
In a separate case, a 53-year-old woman has been arrested in London on suspicion of disseminating terrorist material.
Officers from the Met’s Counter Terrorism Command arrested her in south-west London at around on Tuesday morning under the Terrorism Act and she remains in custody.
“The arrest relates to an investigation into a number of social media posts of an extremist nature,” a spokesperson said.
“Detectives are searching an address in Lambeth where they have seized a number of media devices.”
The investigations come amid warnings that Isis is increasingly seeking to incite global terror attacks as it loses swathes of territory in Iraq and Syria, including the city of Mosul.
Cressida Dick, the Commissioner of the Metropolitan Police, said six plots have been thwarted in the UK in last four months alone and she expects the figure to rise.