Police were called at 11:09hrs on Thursday 5 June to The Shard, St Thomas Street, SE1 after London Fire Brigade were called to reports of a fire at the premises.
Police, London Fire Brigade and London Ambulance Service attended the fire which is beleived to be in the basement of The Shard.
A full evacuation is now underway.
No reported injuries at this time. No arrests. Enquries re cause of fire are ongoing.
More top news
Hundreds of people do no know when they will be allowed back home after a 'serious incident' was declared in east London.
A Tube and rail strike planned for Wednesday evening could bring the capital to a standstill causing travel chaos for millions of commuters
The only Muslim survivor of the 7/7 terror attack in London has urged the country to stand together against Islamophobia.