Ten years to the day London was rocked by the July 7 terror attacks, here are some key facts and figures behind what happened on that awful day.

A total of 56 people died in the attacks: 52 civilians and the four bombers. Over 700 people were injured.

The attacks were the UK's worst terrorist incident since the Lockerbie bombing on December 21, 1988. On that occasion, 270 people were killed when Pan Am Flight 103 was destroyed, including 43 British citizens.

The greatest loss of life in the July 7 attacks took place on the Piccadilly line, when a bomb was detonated on a train between King's Cross St Pancras and Russell Square. A total of 27 people were killed including the bomber, 19-year-old Germaine Lindsay. More than 340 were injured.

In the Aldgate attack, eight people were killed including the bomber, 22-year-old Shehzad Tanweer. A total of 171 were injured, including at least 10 seriously.

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In the Edgware attack, seven people were killed including the bomber, 30-year-old Mohammad Sidique Khan. 163 were injured.

In the Tavistock Square attack, 14 people were killed including the bomber, 18-year-old Hasib Hussain. Over 110 were injured.

The shortest time it took an ambulance to arrive at the scene of any of the Underground attacks was 24 minutes, at Edgware Road station. The first ambulance at Aldgate arrived 25 minutes after the attack, while it was 31 minutes before an ambulance arrived at Russell Square. By contrast an ambulance was on the scene of the Tavistock Square attack after just 10 minutes.

Some 201 rostered ambulances were available to London Ambulance Service controllers, but only 101 were deployed to the site of the attacks. This was because a number of crews were held back in case of more attacks.

Up to 50 people got off the London bus bombed on July 7, minutes before the blast. The bus had been held up by diversions prompted by the other attacks, which led driver George Psaradakis to advise passengers they might be better walking to their destination.

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Over an hour elapsed before firefighters cut open the door on the train damaged by the Russell Square bomb. The first firefighters arrived at King's Cross station at 9.13am (24 minutes after the blast) but did not enter the tunnel until a second crew arrived at 9.42am. The door was finally opened at 10.15am, one hour and 26 minutes after the attack.

The FTSE 100 fell by around 200 points during the two hours after the first attack - its biggest drop since the invasion of Iraq two years earlier in 2003. The market recovered to end the day down 71.3 points or 1.36 per cent on the previous day's three-year closing high.

News websites accounted for 5.6 per cent of all online traffic on July 7, up nearly 50 per cent on the previous day. The BBC news website accounted for just over a quarter (28.6 per cent) of all page impressions on news websites in the UK; Sky News was in third place with 3.8 per cent, and the Guardian fifth with 2.4 per cent.

ITN's coverage of the attacks remains its longest uninterrupted broadcast in its 60-year history, while Sky News did not broadcast any advertisements for 24 hours.