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Special report: 9/11 six months on

New York City authorities will mark tomorrow's six-month anniversary of the al-Qa'ida attacks on the US with a light display.

An intense, 50ft square beam will shoot skywards from the location of the twin towers that fell on 11 September. In another ceremony at 8.45am local time, the precise moment the first plane struck, a sculpture by Fritz Koenig, which was rescued intact from the site, will be re-dedicated in a nearby park.

The relatives of the 62 Britons who died on 11 September will also be marking the half-year anniversary.

Charles and Pauline Berkeley, from Sutton Park, Shrewsbury, lost their son Graham on board the second hijacked plane which smashed into the World Trade Centre.

"There isn't a day that goes by that we don't think of him and it hasn't got any easier as time goes on," said Mrs Berkeley. They are raising money for a scholarship in Graham's name at the Royal College of Music, where he graduated before switching careers to become an IT consultant.

The mother of Richard Dawson is to raise a memorial stone close to his father's grave in Southampton. Helen Dawson said: "We still think about him all the time – that will never go away."

Death certificates have been issued for 71 Britons, dual nationals and foreign nationals based in Britain, but another five people are simply classified as missing, presumed dead.