Bonds gain, dollar mixed

In currency trade, the dollar declined against the yen, while the euro fell against the dollar.

Benchmark 10-year Treasury notes gained 1/32, or 31 cents on a $1,000 note, sending the yield to 4.52 percent from 4.53 late Friday. Bond yields move inversely to prices.

The 30-year note gained 3/32, or 94 cents on a $1,000 note, yielding 4.82 percent, down from 4.83 Friday.

Two-year notes climbed 3/32, pushing the yield up to 4.10 percent. The five-year note gained 4/32 to yield 4.22 percent.

Economic reports will greet investors after the markets open. The biggest one is the Institute for Supply Management's monthly reading on manufacturing activity, which is expected to show a decline in August to 53 from 53.8 in July, which would still indicate some expansion.

Also due are reports on July construction spending and August auto sales.