Scotland Yard have arrested four suspected Islamist terrorists in London on suspicion of plotting a "potentially very serious" terror attack.
Earlier, an 18-year-old man was arrested in the port area of Dover. None of the suspects have been named.
The incident in Streatham was part of an active counter-terror operation during which the male suspect was pronounced dead at the scene. A device strapped on his body was later established as fake at the end of the attack, which counter-terror officers believe to be "Islamist-related".