Police are confirming that 6 people are dead.
Police have shot dead 3 male suspects.
London Ambulance Service has said at least 20 people have been taken to six hospitals across the capital.
Ariana Grande, whose concert in Manchester was the target of a terrorist attack less than two weeks ago, said, "Praying for London ♡"
After a decade of relative quiet, England has now suffered 3 terrorist attacks in 3 months.