(Bloomberg) — Engineers are trying to find out why two steel bolts broke off from the 47-story London tower known as the Cheesegrater, falling five floors to the street.

The base of the unoccupied building on Leadenhall Street in the City of London financial district was cordoned off after the incident, which caused no injuries, according to a statement yesterday from owner British Land Co. Each bolt is about 1 meter (3 feet) long, a spokeswoman said.

“There is no risk to the structural integrity of the building,” said British Land, the U.K.'s second-largest real estate investment trust.

London's new crop of skyscrapers, with nicknames such as the Shard and the Walkie Talkie, have sparked controversy because of their impact on the city's skyline and after design faults were discovered. The Walkie Talkie at 20 Fenchurch Street drew crowds of onlookers last year after reflected sunbeams were hot enough to melt parked cars. Developer Land Securities Group Plc said in June that it received planning approval to install a system to reduce the reflections.

Contractor Laing O'Rourke Plc and structural engineers Arup Group Ltd. have examined the Cheesegrater, officially named the Leadenhall Building, and are inspecting the broken bolts. The results are expected in about 10 days, British Land said.

British Land and Oxford Properties developed the Cheesegrater, which is due to open next year. Aon Corp., the largest insurance broker, and Amlin Plc have agreed to lease space in the building.

–With assistance from Neil Callanan in London.

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