General Motors Corp. built 1.568 million vehicles in North America in the second quarter, exceeding its forecast by 0.9 percent.

General Motors attributed the unexpected production increase to a lack of interruptions at its factories.

The automaker made no change in its third-quarter production, which is declining 4.4 percent to 1.29 million vehicles from a year earlier.

Car production is increasing 2.7 percent to 678,000, while truck production is declining 11 percent to 621,000, the Detroit-based company said.

The announcement comes a week after General Motors, Ford Motor Co. and DaimlerChrysler AG announced their U.S. auto sales fell in June, a decline that exceeded forecasts as buyers opted for cars made by Japanese and European rivals. First-half sales for the auto industry rose 6.1 percent to a record 9.12 million.

GM shares fell 1 to 61 3/8. The stock has declined 7.2 percent in the last 12 months.