Now Playing

D.C., N.Y. On Heightened Alert

Washington, D.C., and New York are on heightened alert Friday. That's because of a new terrorism warning that comes just ahead of the tenth anniversary of the Sept. 11 terror attacks. NPR's Dina Temple-Raston has been looking into the details of the new threat — and tells Melissa Block the latest.

Trouble listening? See our technical support page.