From the FDA: EpiPen and and EpiPen Jr Auto-Injector: Recall - Failure to Activate Device
The FDA on Friday issued an additional recall on EpiPens sold in the U.S. and abroad due to a potential defect that could make the device difficult to activate in an emergency (failure to activate or increased force needed to activate) and have significant health consequences for a patient experiencing a life-threatening allergic reaction (anaphylaxis).