collapsed on a site where flats are being constructed, and crashed on to two adjacent terrace houses on Compton Close, Bow, on Wednesday afternoon.A video posted on Twitter showed a terraced house with part of the roof caved in, and emergency services said "a complex rescue operation" is under way which is likely to take some time.London Ambulance Service (LAS) said crews have treated four people at the scene.A spokeswoman for LAS said: "We treated two of these patients for head injuries and took them to hospital and we assessed the other two patients at the scene."We are working closely with other members of the emergency services at the scene with more updates to follow."The London Ambulance Service later tweeted: "A further update from.
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