Mortgage rates held steady Tuesday. Treasurys benefited from falling stock prices, but mortgage-backed securities were little changed. With no key economic data scheduled for release today in the U.S., investors turned their focus to events in Europe. Protests against austerity measures and a visit by German Chancellor Angela Merkel turned violent in Greece. Meanwhile, the International Monetary Fund (IMF) cut its global growth forecast to 3.3% this year, from 3.5% estimated in July. A deepening recession in Europe and increased economic uncertainty in the U.S. were cited in the reduction.