A couple have been arrested on suspicion of trying to abduct a premature baby at Great Ormond Street Hospital.

The couple, a 31-year-old man and a 25-year-old woman, entered the the world-renowned hospital in Camden, north London, on Monday afternoon.

They told staff that their child had been born at 21 weeks at the Royal London Hospital in nearby Whitechapel, about four miles from Great Ormond Street Hospital, on March 1.

They showed staff a photo of "their baby" in an incubator - believed to be a printout from the internet - and said they had come to collect their child from the neonatal unit.

Staff checked with managers at the Royal London Hospital for premature babies being born on March 1, but found no records and alerted the police.

A police source said the photo shown by the couple had been "screen-grabbed and printed from the web". It is not yet known if it was an image of a baby being treated in Great Ormond Street.