The legal system in Ireland, north and south, is operating a “permanent emergency” and people don’t even notice anymore that exceptional powers have become the norm, according to the UN’s counter-terrorism expert.

A dedicated Garda internet unit would allow it to refer greater volumes of takedown requests to companies concerning online terrorist material, according to the EU’s counter-terrorism chief.

Counter-terror officers have arrested a 55-year-old man at Gatwick Airport.

A London-wide counter-terrorism initiative which will see hundreds of specially trained officers on patrol at potential terrorist targets has been launched.

In the UK, an army bomb disposal squad has carried out a controlled explosion after a detailed search of an address in Chesterfield following recent terror raids where four men were arrested.

A second man has been arrested as part of an investigation in London by counter-terrorism officers.