Activity is contracting in the U.S. manufacturing sector but the number of Americans filing applications for unemployment benefits fell last week, signs that factories are suffering from a global slowdown even as the broader labor market remains healthy.

IHS Markit on Thursday said its Flash Purchasing Managers' Index (PMI) for manufacturing fell to 49.9 earlier this month from 50.4 in July, pointing to a contraction in the sector for the first time since September 2009.

Readings below 50 point to reductions in activity and the August data could heighten fears the U.S. economy is on track to slip into recession, dragged down by economic weakness overseas and an escalating trade war with China.