NEW JERSEY, N.J. (PIX11) -- A fire at the PATH Newport Station that left 19 people injured earlier this month has been linked to signs of "electrical arcing," investigators at the National Transportation Safety Board announced on Wednesday.

An electric arc can form when an electric current goes outside of its normal conductive pathway and comes into contact with a gas-like material, according to the National Fire Protection Association. The arcing can cause a bright flash, intense heat hotter than the surface of the sun and loud noises.

Electric arcs can form as a result of high voltages or currents, moisture, and damaged or degraded insulation, experts at the National Fire Protection Association say.

The NTSB investigation comes after a fire on board a PATH train on Aug. 4 that left 15

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