"Key investors in Rio Tinto have given the mining group's management their backing, piling the pressure on rival BHP Billiton as the deadline for its proposed £67bn takeover bid looms. BHP must either make a formal bid for Rio by February 6 or walk away for six months under Takeover Panel rules."
http://www.telegraph.co.uk/money/main.jhtml;?xml=/money/2008/01/19/cnrio119.xml
