Officials aren't sure what caused a water main break in the Bronx that snarled service on the 6 line during the Monday morning commute.
The 12-inch water main broke at around 6 a.m. Monday at 140th Street and Bruckner Boulevard in Mott Haven, flooding the 143rd Street and St. Mary's station on the 6 line.
Traffic was backed up in the area as crews worked for hours to pump out the water.
Power was restored shortly before 8:30 a.m.
The Department of Environmental Protection says the main dates back to 1880.
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