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NEW YORK - The number of fatalities from the superstorm that struck the Northeast has climbed to 34 -- with many of the victims killed by falling trees.

At least 7.4 million people are currently without power.

Lower Manhattan was among the hardest-hit areas after the storm sent a nearly 14-foot surge of seawater into low-lying streets. A huge fire destroyed as many as 100 houses in a flooded beachfront neighborhood in the New York City borough of Queens early today.

New York's mayor calls it a "devastating storm" -- possibly the worst the city has ever experienced.

The superstorm that was born when Hurricane Sandy came ashore killed at least 10 people in New York City, among more than 30 who were killed across the Northeast. A wall of seawater and high winds slammed the city, destroying buildings and flooding tunnels.

The city was left with no running trains, a darkened business district and neighborhoods under water. Mayor Michael Bloomberg is giving no firm timeline on when basic services will be fully restored. The city had been left nearly isolated -- its bridges and tunnels closed, its subways and airports shut down. But Gov. Andrew Cuomo says most of the bridges are reopening this afternoon.

All of the subway tunnels between Manhattan and Brooklyn were flooded, as were two major commuter tunnels -- the Brooklyn Battery and the Queens Midtown. The head of the city's transit agency says the subway system has never faced a disaster like this one.

Meanwhile, authorities in northern New Jersey say the body of an unidentified man has been pulled out of the Hackensack River, which overflowed its banks and swamped two towns.

The body was recovered Tuesday from the river in the city of Hackensack.

Superstorm Sandy triggered a tidal surge that sent the river and its tributaries overflowing its banks during the middle of the night.

The towns of Moonachie and Little Ferry just to the south of Hackensack both suffered heavy flooding. Rescues of stranded residents continued Tuesday afternoon.

Bergen County officials say flooding also occurred along the river in Hackensack but was less severe than downriver.