Mattel ran a full-page advertisement on Tuesday in several US newspapers, in which it appealed to parents that the company was "working extremely hard to address your concerns and continue creating safe, entertaining toys for you and your children."
Lead is a toxic substance. Under current regulations, children's products found to have more than 0.06 per cent lead must be recalled.
"There is no excuse for lead to be found in toys entering this country," Nord said.
"It's totally unacceptable and it needs to stop."
The CPSC reported that in the previous recall of Polly Pocket play sets last November, three children had been injured by swallowing magnets that had worked loose from the toy.
Two weeks ago, Mattel's Fisher-Price division recalled 1.5 million Chinese-made toys distributed worldwide, citing concerns over levels of lead paint in its products.
Mattel launched an investigation into all of its factories in China and discovered the latest problem during that investigation, Nord said.
Chinese officials temporarily banned Lee Der Industrial Company, the toys' manufacturer, from exporting products after the recall was issued.
Cheung Shu-hung, a Lee Der co-owner, committed suicide at a warehouse over the weekend, apparently by hanging himself, a state-run newspaper reported on Monday.