Three London hospitals have been forced to shut down their entire computer systems for at least 24 hours after being hit by a virus.
The facilities together make up St Bartholomew's (Barts) and The London NHS Trust.
As well as Barts in the City, the Royal London Hospital in Whitechapel and The London Chest Hospital in Bethnal Green are affected.
A spokesman said well-rehearsed emergency procedures were in place.
He could not say whether patient services, including scheduled procedures, have been affected by the glitch, which was first detected at 1200 GMT on Monday.