By Jonathan Davies
Balfour Beatty's shares have fallen by 20% after it issued a third profit warning this year.
The UK's biggest construction company said there would be a shortfall of £75m in its construction services division.
Balfour Beatty has appointed accountants KPMG to review its contract portfolio.
In May, the company's chief executive Andrew McNaughton resigned after a separate profit warning was issued.
Balfour Beatty is currently involved in the construction of motorways, power stations and office blocks, and public private partnership projects in 80 countries around the world.
But the UK construction services sector has been identified as the biggest problem area for the company.
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