The family of a dead Angolan man who fell ill as he was being deported from the UK are calling for an inquiry into his death.
Jimmy Mubenga's family have begun a march from the Angolan Embassy to the Home Office, in central London.
They will deliver a letter to the Home Office calling for an inquiry into claims of force used in deportation.
Mr Mubenga, 46, collapsed on a British Airways plane bound for Angola at Heathrow Airport in October.
He was taken to hospital but was pronounced dead shortly after arriving. Post-mortem tests have so far proved inconclusive.
Three security guards, aged 35, 48 and 49, were arrested in October and released on police bail until December while inquiries continue.
A letter will also be given to the Angolan Embassy calling on authorities to lend their support in an inquiry.