Four men have been arrested on suspicion of terrorism offences in a series of raids across London today.
One 21-year-old suspect was shot with a Taser but did not require medical treatment, Scotland Yard said.
The Metropolitan Police said the men were held on suspicion of being concerned in the commission, preparation or instigation of acts of terrorism.
It is not clear if the alleged offences are linked to Britain or the ongoing conflict in Syria and Iraq.
The suspects, all in their early twenties, were arrested after warrants were executed at addresses across London.
They have all been taken to police stations in central London and remain in custody.
Counter terrorism officers were assisted in the execution of warrants at one of the addresses by officers from the Specialist Firearms Command. No shots were fired.
