9/11 Memorial: 10 years since attacks

http://www.bbc.co.uk/news/world-us-canada-14869230

9/11 anniversary: US marks 10 years since attacks



The US has started to mark the 10th anniversary of the 9/11 attacks on New York, Washington and Pennsylvania.

Security is tight following warnings of a possible al-Qaeda attack.

The US embassy in Afghanistan has begun the ceremonies, with events due later in the sites where four hijacked planes 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.

Metal barriers have been erected on roads near the World Trade Center, while police in New York and Washington are stopping and searching large vehicles entering bridges and tunnels.

The CIA received a warning last week that al-Qaeda may have sent attackers, some of them possibly US citizens, to bomb one of the cities.

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