Peanut Corp. of America, the company that produced the contaminated peanut butter now being widely recalled, lied to Food and Drug Administration investigators about shipping batches of the food known to be tainted with salmonella bacteria, the agency said Friday.

The company had previously told the FDA that some lots of peanut butter had initially tested positive for the bacterium, then were retested and found to be negative before they were shipped. But further investigation showed that the company actually shipped some of the lots before the second tests were completed. Other lots were shipped without testing and, in some cases, no second test was performed even after the first one came back positive.

Also, 32 truckloads were shipped to the U.S. Department of Agriculture, which had been inspecting the plant, for its school lunch programs.