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AP PHOTOS: Images of the approaching superstorm

 Metropolitan Transportation Authority workers cover an entrance to the Canal Street A, C, and E station with plywood to help prevent flooding, Saturd...
 A car goes through the high water as Hurricane Sandy bears down on the East Coast, Sunday, Oct. 28, 2012, in Ocean City, Md.  Governors from North Ca...
 High winds blow sea foam into the air as a person walks across Jeanette's Pier in Nags Head, N.C., Sunday, Oct. 28, 2012, as wind and rain from Hurri...
 Waves break against a bulkhead in the Brigands Bay area of Frisco, N.C. on Sunday, Oct. 28, 2012 as the sound side flooding begins on Hatteras Island...
 Ocean water rolls over NC 12 at the north end of Buxton, N.C. at dawn on Sunday, Oct. 28, 2012. Waves from offshore Hurricane Sandy are battering Hat...
 A maintenance worker named Vitto attaches plywood to a sidewalk grate at the 2 Broadway building of Lower Manhattan in New York, Sunday, Oct. 28, 201...

APTOPIX Superstorm

Metropolitan Transportation Authority workers cover an entrance to the Canal Street A, C, and E station with plywood to help prevent flooding, Saturd...

Superstorm

A car goes through the high water as Hurricane Sandy bears down on the East Coast, Sunday, Oct. 28, 2012, in Ocean City, Md. Governors from North Ca...

APTOPIX Superstorm

High winds blow sea foam into the air as a person walks across Jeanette's Pier in Nags Head, N.C., Sunday, Oct. 28, 2012, as wind and rain from Hurri...

Superstorm

Waves break against a bulkhead in the Brigands Bay area of Frisco, N.C. on Sunday, Oct. 28, 2012 as the sound side flooding begins on Hatteras Island...

Superstorm

Ocean water rolls over NC 12 at the north end of Buxton, N.C. at dawn on Sunday, Oct. 28, 2012. Waves from offshore Hurricane Sandy are battering Hat...

APTOPIX Superstorm

A maintenance worker named Vitto attaches plywood to a sidewalk grate at the 2 Broadway building of Lower Manhattan in New York, Sunday, Oct. 28, 201...

Big waves washed over roads in Virginia and flooded parts of coastal Maryland as Hurricane Sandy headed north.
Across the Northeast, people boarded up windows and filled sandbags in preparation for the hybrid storm system. Forecasters warned that the megastorm could wreak havoc over 800 miles (1,300 kilometers)from the East Coast to the Great Lakes.
Here's a look at AP photos of the storm and preparations so far in the U.S.: