Zombies Rise

Background: It was all normal until a siren was heard throughout the city of Millsberry, 500 miles away from Metroville. A sudden bomb had dropped onto Millsberry and the radioactive particles infected the survivors of the bomb. These zombies can move very fast and is making its away to Metroville. Can our hero's stop this invasion? Or become like the rest, the zombies....
(This is an AU where my oc's are surviving through an invasion of zombies.)