Around 60 firefighters are tackling a blaze at a factory in Greenwich. Smoke can be seen billowing across south-east London. The fire is at a swimming pool chemical plant and people in the vicinity are being advised to keep windows and doors shut. Deputy Assistant Commissioner Bernie Higgins is the Incident Commander:
The fire brigade says it's still trying to find out what caused the blaze, describing the 80m-long building as "well alight".
Many people are reporting on Twitter that what's being described as an "air-raid siren" can be heard across the area.