Four men remain in custody in England this afternoon - over allegations of a plot to carry out a terror attack in the UK.

They were arrested in anti-terror raids across West London and Buckinghamshire, two days before Remembrance Sunday events.

Britain's Defence Minister Anna Soubry says security had been raised ahead of tomorrow's commemorations:

A 27-year-old man was arrested at gunpoint in a car in the street in Southall, west London.

Two other suspects, aged 22 and 25, were detained at addresses in Hounslow and Uxbridge, also in the west of the capital.

The fourth man, 19, was detained at an address in High Wycombe, Buckinghamshire.

Armed police took part in the operations in Southall, Hounslow and High Wycombe but no shots were fired.

The arrests were made on Thursday evening and in the early hours of Friday.

Counter-terrorism officers were leading searches of various properties in Hounslow, High Wycombe, Uxbridge, Southall, Greenford and Hayes.

The four men were all taken to police stations in central London.

Scotland Yard said the arrests and subsequent searches were part of an "ongoing investigation into Islamist-related terrorism".

The arrests came a few months after the national terror threat level in the UK was raised from substantial to severe, meaning a terrorist attack is "highly likely".