HOMES in Uxbridge, Hounslow and High Wycombe were raided overnight and a driver arrested in a Southall street.
A total of four men were arrested as part of an investigation into Islamist-related terrorism.
They remain in custody pending further inquiries.
A man of 25 was arrested in Uxbridge at 2.55 this morning.
A 27-year-old was arrested in a car in a Southall street at 10.31 last night, with armed police on standby.
No shots were fired during the arrests.
Officers are searching addresses in Hounslow, High Wycombe, Uxbridge, Southall, Greenford and Hayes.
The men have been arrested on suspicion of being involved in terrorist-related activities.
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