U.S. Treasuries and other national government debt are the most dangerous market there is and investors should avoid the securities because of governments' excessive borrowing, Dan Fuss, vice chairman of investment manager Loomis Sayles, told Reuters on Tuesday.

The most dangerous market there is is national government debt because the borrowing doesn't seem to be ending soon -- and it's not just a U.S. phenomenon, Fuss, who helps oversee more than $142 billion in assets at Boston-based Loomis, said in an interview.

Fuss added he thinks that the Federal Reserve -- the U.S. central bank -- will not raise short-term interest rates for all of 2010. (Reporting by Jennifer Ablan; Editing by James Dalgleish)