The Senate will investigate foreign governments buying up crucial Australian assets as passions heat up over Chinalco's grab for a bigger share of Rio Tinto.The Senate Economics Committee will examine foreign acquisitions by state-owned overseas companies, as well as the workings of the Foreign Investment Review Board.The committee is due to report mid year.The inquiry comes as pressure mounts on the Rudd government to think twice about a sizeable chunk of one of the nation's premier miners disappearing into Chinese hands. Read more...