NYC utility probes electric flash that lit sky in eerie blue

Blue light over New York is seen from Manhattan on Thursday. (AP Photo/Jay Reeves)

The night sky is illuminated in a bright, blue color after an explosion in the Queens borough of New York, Thursday. (AP Photo/Sophie Rosenbaum)

NEW YORK — Electric utility Con Edison was working Friday to figure out what caused a high-voltage equipment failure that unleashed an otherworldly flash of bright blue light in the night sky over New York City.