Sinovel revealed the probe in astatement to the Shanghai Stock Exchange (SSE).

Sinovel did not reveal further details, other than to say that itwould co-operate with the investigation.

The news sent shares in Sinovel plunging almost 10% at the close of trading in Shanghai today.

Sinovel first revealed it wasthe subject of inquiries by the Chinese regulators last May.

The criminal probe is thelatest of several legal fronts on which Sinovel – formerly China’s biggestsupplier of wind turbines and at one stage the global number-two – finds itselffighting.

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