S&P Global said its final manufacturing purchasing managers' index (PMI) fell to 47.7 points last month from 50.6 in August, dropping below the 50.0 line denoting growth in activity.

"According to companies, higher energy prices were the main factor at play in September," said S&P Senior Economist Joe Hayes.

Excluding the declines seen since the pandemic began, it was the sharpest contraction for almost a decade, S&P Global said, adding that this indicated a "deterioration in the health" in the sector.

"Businesses were pessimistic in their assessment of the next 12 months, the first time this has been the case since the start of the pandemic over two years ago", said Hayes.

(Reporting by Tassilo Hummel; Editing by Hugh Lawson)