WASHINGTON — U.S. wholesale businesses increased their stockpiles at a faster rate in April, responding to a strong gain in sales. The increase could be a good sign for economic growth in the April-June quarter.

The Commerce Department said stockpiles grew 0.6 percent at the wholesale level in April, double the March gain. Sales by wholesale businesses jumped 1.1 percent in April, nearly three times the March sales gain.

Stockpiles at the wholesale level stood at $483.5 billion in April. That's 25.6 percent above the post-recession low of $384.9 billion in September 2009.

It would take roughly five weeks to exhaust all wholesale stockpiles at the April sales pace. That's considered a healthy time frame.

When businesses step up restocking, they order more goods. That generally leads to increased factory production and higher economic growth.

Slower growth in inventories held back growth in the January-March quarter. In the first three months of this year, the economy grew at an annual rate of 1.9 percent.