The 1,100-acre Pinnacle Park west of Asheville remains closed after a runner's foot was impaled by a nail purposely placed on a popular trail that leads to the Black Rock Summit.

Brian Barwatt, an engineer with the Department of Transportation, and the race director of the Assault on Black Rock, a trail race in Pinnacle Park in March, was at the park Monday with the Sylva police chief Davis Woodard, town maintenance workers and other volunteers scouting out more nails.

Since Saturday, 40 nails hammered into tree roots and logs have been found, Barwatt said.

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“We’re literally blowing every leaf off trail, and following behind with metal detectors. “It was a deliberate effort. Someone hammered 4-inch long galvanized nails and left them sticking out a half- to 1 inch, and at an angle so they’re like spikes.