A 27-year-old female UK national has been arrested at Heathrow Airport after arriving on a flight from Ethiopia on suspicion of preparing terrorist acts, Scotland Yard said.

The woman arrived on a flight from Addis Ababa and was arrested on suspicion of preparation of terrorist acts under section 5 of the Terrorist Act 2006.

A Metropolitan Police spokesman said: 'She was detained under PACE and taken to a south London police station, where she currently remains in police custody.

'Enquiries continue.'

The woman arrived on a flight from Addis Ababa to Heathrow Airport (pictured) and was arrested on suspicion of preparation of terrorist acts under section 5 of the Terrorist Act 2006.

More to follow.