A fire broke out at the National Archives in Kew, home to some of the UK's most important historical documents.
Some 20 firefighters tackled the blaze, which affected two disused water towers at the site in Richmond, south-west London.
London Fire Brigade(LFB), which was called out at about 12:30 GMT, said the blaze was now out.
The National Archives is the official UK government archive and publisher.
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