Firefighters were called to a fire in an office at the Royal Free Hospital in the early hours of this morning.
The brigade were called to Rowland Hill Street - which runs along the rear of the Hampstead hospital.
Four fire engines and about 25 firefighters spent just over an hour fighting the fire - which damaged a small part of the office in question.
After being called at 3.47am, the fire was under control by 4.48.
No-one is thought to have been injured.
Fire crews from West Hampstead and Kentish Town fire stations attended and the cause of the fire is under investigation.
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