Toyota will be coming under more scrutiny as the National Highway Traffic Safety Administration opened a probe into the automaker's recalls—and whether they happened fast enough. NHTSA requested documents from Toyota, including its production data and consumer complaints, to determine exactly when the company realized its cars had defective gas pedals or braking systems. Regulators say the number of people confirmed to have been killed by unexpected acceleration has climbed to 34. U.S. law caps any fines that could be imposed on the car giant at $16.4 million. With sales stalled, Toyota also announced Tuesday that it would halt production at two American plants for at least 11 days to prevent inventory from piling up.