(CNN) — An electric wiring problem likely caused the fire this month that damaged a massive swath of New Jersey’s boardwalk, which had been freshly rebuilt after Superstorm Sandy wrecked it last October, authorities said Tuesday. An investigation ruled out human involvement in the fire.
The fire began underneath the Kohr’s Frozen Custard building in electrical wiring installed after 1970. The wiring had sustained damage from sand and salt water during Hurricane Sandy, Ocean County Prosecutor Joseph D. Coronato said.
A spark blew apart the live wires under the boardwalk beneath the building, said Jessica Gotthold, an ATF agent. Investigators spent 40 hours combing the scene for evidence and will continue monitoring the site to prevent looting.