A woman has been arrested at Heathrow Airport on suspicion of preparing terrorist acts, Scotland Yard has said.
The 27-year-old is a UK national.
She had just arrived on a flight from the Ethiopian capital of Addis Ababa when she was arrested on Friday.
Police said she had been taken to a south London police station, where she remains in custody. Enquiries continue.
"A UK national". Fifty cents says that she should be described as "a UK-passport-holding Muslim".