Four men have been arrested on suspicion of planning a UK-linked terror plot.
Scotland Yard said the men were detained under the Terrorism Act in east London on Wednesday.
The planned arrests were part of an ongoing investigation by the Metropolitan Police’s Counter Terrorism Command and MI5.
Officers arrested three of the men – aged 18, 25 and 27 – at their home addresses in east London, while a 24-year-old man was arrested near to his home address in east London.
Police were on Wednesday afternoon searching five residential addresses in east London and one business address, also in east London.
The suspects are in custody at a south London police station.
They were arrested on suspicion of being concerned in the commission, preparation or instigation of acts of terrorism under section 41 of the Terrorism Act 2000.
A Met spokesman said: “These arrests were pre-planned as part of an ongoing investigation by the Met’s Counter Terrorism Command and MI5.
“The arrests are linked to activity in the UK.”