Jean Charles de Menezes, 27, died last Friday after being shot eight times on a train at the south London station.

The Independent Police Complaints Commission is conducting the inquiry.

Mr Menezes' funeral is to take place in his home town of Gonzaga on Friday. A requiem mass will be held at London's Westminster Cathedral at the same time.

Mr Menezes' family and friends based in London are set to attend the Westminster mass, which will be conducted by Father Frederico Ribeiro, chaplain of the Brazilian community in the capital.

Cardinal Cormac Murphy-O'Connor, the Archbishop of Westminster, will read a message at the end of the service.

"The Brazilian Catholic community is angry and grieving and the Cardinal felt it was important to accompany them at the funeral," said a spokesman for the head of the Roman Catholic Church in England and Wales.

Expired visa

On Thursday the Home Office said the visa of Mr de Menezes expired two years before he was shot by police.

A passport stamp apparently giving him indefinite leave to remain "was not in use" on that date, added officials.

Home Office officials said they wished to end speculation over his immigration status but added that the statement was not intended to influence any investigations.

Some of the dead man's relatives have questioned the police account of events and called for the banning of the Met's shoot-to-kill policy for suicide bombers.

Scotland Yard has admitted Mr Menezes was not connected to the attacks.

Metropolitan Police chief Sir Ian Blair has apologised to his family but defended the force's policy as the "only one way to stop someone who is a suicide bomber".