Hong Kong authorities raided the local offices of Chinese brokerages China Construction Bank (HKG:0939, SHA:601939) and CSC Financial (SHA:601066, HKG:6066) as part of a probe into misconduct during share offerings, Reuters reported Wednesday, citing sources.

The investigation by the city's Securities and Futures Commission comes amid a boom in IPO activity that has pressured banks and exposed gaps in due diligence and listing practices, the report said.

It was not yet clear which share offerings were the focus of the regulatory probe.

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