Carlyle will channel an additional 584 million yuan (US$73.92 million) into Xugong to raise its stake to 50 per cent under the deal signed on Monday, said the statement.

This is the second major concession Carlyle has made in the Xugong deal after it agreed earlier this month to cut its stake to 50 per cent.

Last October the US firm agreed to buy 85 per cent of Xugong for US$375 million, the biggest foreign acquisition of a controlling stake in a leading State-owned company in China.

The deal was submitted to the Ministry of Commerce for approval last year, but was turned down amid concern that foreign control of key Chinese firms could threaten the country's economic security.

Analysts said industry leader Xugong owns advanced technologies and that the sale of a number of such companies to foreign firms may result in China losing its technology to foreign competitors.

They also said that China was selling its strategic companies to foreign investors too cheaply.

The Xugong deal has drawn attention to other acquisitions such as the proposed takeover of the Luoyang Bearing Corporation, a leading bearing producer in China, by Germany-based Schaeffler Group.

The Ministry of Commerce and other authorities issued new rules in August concerning the acquisition and takeover of Chinese enterprises by foreign investors.

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