The arrests were made as part of an ‘ongoing investigation into Islamist-related terrorism,’ according to a spokesman.

British authorities extended the detention of four men, held on suspicion of plotting a terrorist attack, for seven days during which detectives will begin another round of questioning, Agence France-Presse reported.

The four men, whose ages range between 19-27, were arrested overnight on Thursday on suspicion of being involved in the facilitation, preparation or instigation of a terrorist act.

“Warrants for further detention have been granted for all four men for a further seven days,” said a spokesman for the Scotland Yard police headquarters.

The plot was allegedly planned for British soil, according to media reports.

The arrests were made as part of an “ongoing investigation into Islamist-related terrorism,” according to the spokesman.

Three of the arrests, in west London, had involved armed forces, but AFP reported there were no shots fired. The four suspects were arrested in west London and west of the capital.

Additionally, authorities said that several addresses have been searched.

All four men remain in police custody.

The arrests come a few months after the national terror threat level in Britain was raised from substantial to severe, meaning a terrorist attack is considered “highly likely.”

Police tape could be seen across the front of two residential addresses in High Wycombe, west of London, including one with several satellite dishes attached, with officers on duty outside.

Police tape marks off the front of a residential address north west of London, on November 8, 2014.

 
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