Cop in North Carolina Mistakes Television Production for School Shooting

Police say they weren't informed

A deadly serious deputy made an urgent radio call to his dispatcher, sounding the alarm that 20 shots were fired near an elementary school … and TMZ has the audio.

The incident went down in Wilmington, N.C. last week, when a TV production crew -- working on a Stephen King show, "Under the Dome" -- staged a shootout scene in a park near the school.  The shots were fake, but no one clued in police or school officials … and they treated it like the real deal.