A determination by the IRB Chair, a designated IRB member, or the convened IRB to temporarily interrupt some or all previously-approved research activities. The suspended activities could include, but not be limited to, recruiting and enrolling new subjects. Suspended studies remain open and require continuing review. NOTE: Suspensions of IRB approval apply to interruptions in research activities due to concerns about the safety, rights, or welfare of human research subjects or others. They do not include interruptions in human research resulting solely from the expiration of the IRB approval period.