Updated

Growth at U.S. service companies slowed in September from an eight-year high in August, as sales fell sharply, new orders dipped and hiring weakened.

The Institute of Supply Management says its service-sector index fell to 54.4 in September, down from 58.6 in August. August's reading was the highest since December 2005. Any reading above 50 indicates expansion.

A measure of sales fell seven points to 55.1, indicating much slower growth. And a gauge of hiring also dropped sharply to 52.7 from 57 in August.

The report measures growth in service industries, which cover 90 percent of the workforce, including retail, construction, health care and financial services.