10-year Treasuries edged down, taking their cue from firmer stocks but mostly sticking close to recent levels as investors await the Federal Open Market Committee's announcement.

"This is a week in which a lot of events awaited, ahead of which big moves aren't likely," said Tomoaki Shishido, fixed income analyst at Nomura Securities.

The yield on U.S. 10-year notes was slightly higher at 1.668 percent on Tuesday from 1.665 percent in trading on Monday, but still not straying far from a more than four-month low of 1.643 percent hit a week ago.