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Craig Ruttle, Associated Press
Andrea Grolon walks through waist-deep water in the Metropolitan Trailer Park in Moonachie, N.J. on Tuesday, Oct. 30, 2012. Grolon, a resident of the trailer park, was wading through oil covered water to help others get to rescue vehicles in the wake of superstorm Sandy.

MOONACHIE, N.J. — New Jersey Gov. Chris Christie says the sudden middle-of-the-night flooding of two towns was the result of a tidal surge that sent water overflowing a natural berm.

The governor says the surge hit the Hackensack River.

He says hundreds of people have been rescued from the low-lying towns of Moonachie (moo-NAH'-kee) and Little Ferry.

Residents of a Moonachie mobile home park say water overflowed a nearby creek when the tidal surge occurred. In Little Ferry they say water gushed out of storm drains.

Local and county officials initially reported a levee had broken, but the governor says that was erroneous.