The Transportation Security Agency released statistics Tuesday showing an unusually high rate of agents taking unscheduled leave nationwide.

TSA screeners are expected to work without pay due to a partial government shutdown now in its 25th day, and many are now simply not showing up. As a result, long lines and wait times as well as terminal closures have been reported at airports nationwide. There are also rising concerns about security, stoked by reports of a woman recently passing through a TSA screening checkpoint with a loaded gun before her flight from Atlanta to Japan.