The Met Police said officers were called to a disturbance at around 10:45 GMT. A passer-by, Callum Fahim, said he saw a man leaning out of a third-floor window waving a large knife around.

One passer-by, Callum Fahim, told the BBC that he saw a man leaning out of a third-floor window and waving a large knife around. "There are two armed police officers with a gun aimed at him ...