In pictures: Gathering grief

The search for survivors and bodies continues in New York and Washington as the number of those missing or believed dead nears 5,000.

Meanwhile the people around the world continue to display their horror at Tuesday's terror attacks and their sympathy for the victims and their families.

The desperate search for survivors is still going on

Rescue attempts are hampered by fires that are continuing to burn

The streets of New York are littered with desperate pleas for information on the thousands still missing

At the Pentagon exhausted rescue workers take a break

Across America flags festoon every street as people show their solidarity

The cleanup operation is underway

As shock gives way to anger, some are calling for revenge

Shops in the Arab areas of Manhattan remain closed

American air space has started to open up, allowing the first flights to get underway

Floral tributes continue to be laid by mourners all around the world

Workers at the Chicago Exchange held a minute's silence as trading began again

The guards at Buckingham Palace played the US national anthem at a special ceremony