Samsung Electronics and the US Consumer Product Safety Commission (CPSC) agreed on an expanded recall of original and replacement Note 7 smartphones, increasing the number of devices that can be returned to 1.9 million.

US safety regulators started an official recall of Samsung Electronics’ Galaxy Note 7 smartphone, about two weeks after the company halted sales following reports of dozens of devices catching fire or exploding.

Samsung Electronics has blamed a minor battery manufacturing flaw for prompting a global recall of its Galaxy Note 7 smartphones and is seeking more time to investigate the cause behind its deepest crisis in years.