WASHINGTON – Johnson & Johnson executives and the Food and Drug Administration both shouldered the blame Thursday for a secret recall in which hired contractors quietly bought up defective painkillers to clear them from store shelves.

J&J Chief Executive William Weldon told House lawmakers the company “made a mistake” in conducting the so-called “phantom recall,” which is one of a string of problems that have drawn congressional scrutiny

In the same committee hearing, the FDA’s deputy commissioner, Dr. Joshua Sharfstein, said his agency should have acted sooner to halt J&J’s plan. At the same time, though, he stressed that regulators were not aware of the deceptive nature of the recall.

Sharfstein and Weldon testified before the House Committee on Oversight and Government Reform, which held its second hearing on J&J’s unprecedented spate of recalls. The largest, involving more than 135 million bottles of infants’ and children’s Tylenol and other medicines, triggered the committee probe.