Investors sought safety in U.S. government bonds as a gauge of the manufacturing sector in China fell to a 3-year low, adding to worries over the world’s second-largest economy and its ripples globally. Global stocks sold off and U.S. crude oil prices dropped after a surge on Monday. ISM manufacturing index is due at 10 a.m. with economists expecting 52.7, unchanged from July. This week’s key release is Friday’s non-farm jobs report. Fed officials signaled last week the door remains open on a rate hike in a few weeks, though many investors say the Fed could hold off if risky markets continue to sell off which would rattle investors’ confidence on growth outlook. The yield on the 10-year note was 2.167% vs 2.204% Monday.

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