On Monday, General Motors announced that the automaker added 8.2 million vehicles to its huge list of cars recalled over faulty ignition switches.

CEO Mary Barra said that the recalls come from an extensive safety review. "If any other issues come to our attention, we will act appropriately and without hesitation," Barra said in a statement, according to the Associated Press.

It is a larger number of recalls for GM, totally 28 million. GM said it was aware of three deaths, eight injuries, and seven crashes involving the midsized cars.

The company suspects that faulty switches caused the crashes, but it has found no conclusive evidence. The company recalled the vehicles after claims were filed. The faulty switch is linked to at least 13 deaths, according to Forbes. GM said that it was also aware of injuries and crashes involving the vehicles.

Seven vehicles were recalled, including the Chevrolet Malibu and the Pontiac Grand Prix. The announcement halted the trading of GM stock on Monday afternoon. Stock was traded again after a half hour.