FOUR men have been arrested in the Thames Valley and West London on suspicion of being involved in terrorist activity.

Update: police confirm that an 19-year-old from High Wycombe was amongst those arrested.

Officers are refusing to confirm any further details of the arrests at this point, but the BFP understands they may be connected to police activity at an address in Desborough Avenue, High Wycombe, which has been cordoned off by officers today.

National media descended on the town today as news of the police operation broke.

There has been speculation amongst the national media that the timing of the arrests may be significant ahead of the Remembrance Day weekend.

Officers from the Metropolitan Police's Counter Terrorism Command say they made the arrests over the course of last night and the early hours of this morning.

The four men were arrested on suspicion of being concerned in the Commission, Preparation or Instigation of acts of Terrorism.

Police said three of the men - aged 22, 19 and 25 - were arrested after warrants were executed at addresses in West London and Thames Valley.

A fourth man, aged 27, was arrested in the street in West London by armed officers.

They have all been taken to police stations in central London and remain in custody. No shots were fired.

Officers are searching three addresses in High Wycombe, one in Hounslow, Uxbridge, Southall, Greenford and Hayes.

A number of residential addresses and vehicles are being searched by specialist officers in west London and Thames Valley as part of the investigation.

The Metropolitan Police said these arrests and searches are part of an ongoing investigation into Islamist related terrorism, and that officers from the Met’s Counter Terrorism Command are working closely with their colleagues in SE Counter Terrorism Unit and MI5.

Officers added that the searches are ongoing as enquiries continue.