But Waldrum and his colleagues carried out a theoretical calculation of the risk of loss of life due to lightning in a similar building frequented by large numbers of people, in a similar setting - assuming the lack of any lightning protection.

BBC: What is the chance of lightning striking St Peter's?

However, the allegations raise ethical questions about the Popular Party's dealings during the period of Spain's building boom, when politicians granted large numbers of development contracts.

BBC: Spain ruling Popular Party denies slush fund allegations

But until then, these Middle Eastern conglomerates will continue to invest in large numbers in order to keep building their global brands.

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