WASHINGTON (AP) — U.S. factories expanded last month at the fastest pace since June 2011 on a jump in orders. The report signals that manufacturing output could strengthen in coming months.

The Institute for Supply Management, a trade group of purchasing managers, said Tuesday that its manufacturing index rose to 55.7 in August from 55.4 in July. That topped the index’s 12-month average of 52. A reading above 50 indicates growth.