By Daniel Hunter

China Investment Corporation (CIC) have announced that they have brought a 10% stake in the firm that owns London's Heathrow airport.

CIC, China's sovereign wealth fund set up in 2007, make the purchase after some other countries have raised concerns about selling key assets to Chinese firms.

Last month, US President Barack Obama blocked a wind farm deal involving Chinese firm Ralls Corp on national security grounds.

Despite these issues, the UK has been growing its business ties with China.

This is CIC's second major investment in UK infrastructure. It bought 8.68% of the firm behind UK utility group Thames Water in January.

The fund will pay £450m ($726m) for the 10% stake in Heathrow Airport Holdings Ltd.

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