A 20-year-old man has died after being chased by police and apprehended in a shop in east London.
The man went into a shop where he was seen trying to swallow an object, Scotland Yard confirmed.
A spokesman said: The man entered a shop in Kingsland Road, where he was seen to be trying to swallow an object.
The officer intervened and sought to prevent the man from harming himself, but he was then taken ill.
CCTV footage posted on social media under the hashtag #justiceforRash appears to show officers restraining a young man inside a shop.
A spokeswoman for the Independent Police Complaints Commission confirmed the video is linked to the incident.
London Ambulance Service attended, and before they arrived first aid was provided by officers, including a police medic.
The man was then taken to an east London hospital, where he was pronounced dead around an hour later.
His next of kin have been informed. A post-mortem examination and formal identification are to take place.
The Independent Police Complaints Commission is investigating the incident, and the Directorate of Professional Standards has also been informed.