Super Bowl power cut still mystery
The cause of the 34-minute power cut at the Super Bowl in New Orleans remains under investigation.
But public records show that Superdome officials were worried about a power outage several months before the big game on Sunday night.
An October 15 document released by the Louisiana Stadium & Exposition District, which oversees the Superdome, says tests on the dome's electrical feeders showed they had "some decay and a chance of failure".
The document also says 2011 blackouts that struck Candlestick Park, where the San Francisco 49ers were playing a nationally televised game, were one reason for ordering the tests.
The state board later authorised spending nearly a million dollars (£635,000) on Superdome improvements, including more than 600,000 dollars (£380,000) for upgrading the dome's electrical feeder cable system.
The power cut happened early in the third quarter, with the Baltimore Ravens leading the San Francisco 49ers 28-6. Play finally resumed with just over 13 minutes left in the third quarter. The game was won by the Ravens 34-31.