A 16-year-old boy has been arrested on suspicion of arson after a blaze at the London Oratory School in west London.
Ten fire engines and about 100 firefighters were called to the Catholic school on Seagrave Road in Fulham at about 10:00 BST.
"An atrium is alight in a four-storey building with basement", the London Fire Brigade (LFB) said.
The Met Police said it arrested the boy at about 11:15 and he was taken into custody.
The force said no injuries had been reported at the school, which is a short distance from Chelsea's Stamford Bridge stadium.
The brigade said the fire was under control by 11:47 and the cause was under joint investigation with the Metropolitan Police.
A nearby shopping centre and some residential addresses were evacuated as a precaution while residents were urged to keep their windows closed.
Fire crews from Fulham, Chelsea, Kensington, Wandsworth, Hammersmith, Clapham, Lambeth and Soho fire stations remain in attendance, the LFB said.
The London Ambulance Service said it had not treated any patients.
A spokesperson said: "We sent a number of resources to the scene, including ambulance crews, an incident response officer, a medic in a fast-response car and members of our hazardous area response team.
"Our first medics arrived at the scene in less than three minutes."
A Metropolitan Police spokesperson said earlier that officers had no knowledge of there being any casualties.
"The cause of the fire is currently unknown and will be investigated," the spokesperson said.
The school's alumni include actor Simon Callow, trade unionist Mick Whelan, as well as the children of the former prime minister Sir Tony Blair, Harriet Harman and former deputy prime minister, Sir Nick Clegg.
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