Chubb had “significant property exposure” in the World Trade Centre, with pre-tax losses expected to be between US$100m and US $200m (£68m and £136m).

Chubb Corporation chief executive Dean O'Hare said it was too early to accurately estimate the financial impact on Chubb.

But, based on preliminary reports and estimates, he said the company “believes it has significant property exposure in the World Trade Centre, both for the structure and for businesses housed in the towers”.

"Significant reinsurance that is in place is expected to limit Chubb's pre-tax loss to the range of $100m to $200m, subject to revision as more facts become known,” O'Hare said.

“In addition, the company will also pay customers' claims under business interruption and accident and workers' compensation coverages, but it is unable at this time to quantify the potential exposure for these losses.”

He said the company would do everything in its power to quickly process claims and make payments for losses.

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