Co-developers British Land and Oxford Properties said that no one had been hurt and there is no risk to the structural integrity of the building but it is taking precautions and has launched a full investigation.
The 47-storey Cheesegrater, officially called The Leadenhall Building is at 122 Leadenhall Street in the City of London. Its construction was completed by Laing O'Rourke just in the summer.
Two bolts are known to have broken. The bolts connect the nodes on the megaframe, but the design of the structure allows for isolated events of this type and do not affect the structural integrity of the building, engineers say.
One part of one of the bolts that broke became dislodged and fell to the ground at the side of the building within the hoarding line.
A full investigation is being conducted by Laing O'Rourke and the building’s structural engineer Arup.