Police were called at approximately 12.45 today following reports of an electrical explosion on a building site at the junction of High Holborn and Drury Lane.
Officers, London Fire Brigade and London Ambulance Service are in attendance. One man believed to be in his 20s is being treated at the scene.
The Health and Safety Executive will be notified.
Road closures remain in place.
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The men were using ropes to lever the sofa up to the first floor apartment because it was too large to fit through the doors.
He's not even halfway.
Photos taken by housing officers show how they could barely see the floor as it was covered with mattresses.