Updated: Saturday, 23 February 2013 04:40 | By Agence France-Presse

US seeks 'tens of millions' from Armstrong

Seeking "tens of millions of dollars" paid to Lance Armstrong for "years of broken promises," the US government joined a lawsuit Friday alleging the doping cyclist defrauded former sponsor US Postal Service.

"Lance Armstrong and his cycling team took more than $30 million from the US Postal Service based on their contractual promise to play fair and abide by the rules -- including the rules against doping," said Ronald Machen, US Attorney for the District of Columbia.