New York on high alert as they mark Tenth anniversary of 9/11 attacks

New York Twin Towers attack

BBC News…Sept 11, 2011 – The US is marking the 10th anniversary of the 9/11 attacks on New York, Washington and Pennsylvania.

Commemorations are taking place in all three sites where four hijacked airliners struck, killing nearly 3,000 people.

An official memorial to those who died is to be unveiled at the site of the World Trade Center, whose twin towers were destroyed in the attacks.

President Barack Obama has said the US remained vigilant against terrorism.

As in previous anniversaries, the names of all the victims will be read out at the New York event.

There will be pauses for silence at the exact times when two airliners smashed into the World Trade Center’s twin towers, the third was crashed into the Pentagon and the fourth was forced into a field in Shanksville, Pennsylvania, by passengers who fought with the hijackers.