Inventories of wholesalers rose to a three-year high, the Commerce Department said, offering yet another sign of a potential slowdown in the economy.

The buildup of inventories rose a bigger-than-expected 0.8% to a seasonally adjusted $392.92 billion, the report said. Meanwhile, wholesale sales fell by 0.5% in October to $327.78 billion. This was the second decline in sales in a row and the first pair of consecutive declines since April and May 2003.