To mark the ten year anniversary of the London 7/7 terrorist attacks, HuffPost is running Beyond The Bombings, a special series of interviews, blogs, in-depth features and exclusive research reflecting on how Britain has changed since.
It is a phone call no one hopes they ever have to make, and one that probably haunts a London office worker to this very day.
The call to emergency services on July 7, 2005, reporting a bus explosion near Travistock Square, is as haunting today as it was 10 years ago.
The 30-odd-second conversation captures the man's distress and confusion, having just seen an explosive tear through a double-decker bus at 9.47am. The attack, near King's Cross, was the last of four on London's transport network that claimed 52 lives and left some 800 injured.
The man, who has never been identified, describes the scene in chillingly basic terms, saying “a bus has just exploded outside in Tavistock Square - just outside my window”.
13 people lost their lives in the attack on the number 30 bus on 7 July, 2005
The man goes on to say, “there’s people lying in the road… there’s people trying to get out,” before saying, “I think there’s ambulances on the way, but there’s people dead”.
The sound of sirens can be heard at the end of the call, as emergency services arrive on the scene.
Hasib Hussain, 18, had detonated an explosive on the number 30 bus killing 13 people and injuring a further 110.
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The bus exploded in front of the headquarters of the British Medical Association, where a conference was taking place. This meant that whilst there wasn't a lot of medical equipment available, scores of doctors were on hand to help save lives, inquests after the tragedy heard.
Cruelly, many of those on the bus boarded after being diverted from tube stations where attacks had already taken place at Aldgate, Edgware Road and Russell Square.
A short service is to take place at Tavistock Square today to remember those killed in the bus bombing. Flowers will be laid in their memory.
Families grieve at the site of the Tavistock Square attack
George Psaradakis, who was driving the bus when tragedy struck, has spoken of the ordeal for the first time, and recalled how the vehicle was so full he had to stop and ask people to get off.
“Even if my vocabulary had all the words in the world, I would still not find the right ones to describe my feelings about what I saw that day, he told the Daily Mail. “It was like a bomb exploded inside me too.”
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MORE BEYOND THE BOMBINGS:
Here we remember each of the victims