AVONDALE, Penn. (Reuters) - When the Federal Reserve eventually begins to sell some of the assets it has accumulated over the last few years it risks logging losses if longer-term interest rates are rising, a top central bank official said on Thursday.

Philadelphia Fed President Charles Plosser said there is a political risk if the central bank ends up selling the longer maturity assets in its portfolio at a loss.

(Reporting by Jonathan Spicer; Editing by Leslie Adler)