A 5.8 magnitude earthquake centered near Washington, D.C., shook the East Coast on Tuesday, with shocks felt as far south as Florida and as far north as Maine and Ontario.

The shaking was felt at the White House and parts of the Pentagon, sent office workers rushing into the streets of the nation's capital and rattled nerves in New York City. It came as the eastern seaboard was busy bracing for a hit from Hurricane Irene.

The North Anna Power Station, a nuclear plant in central Virginia, lost off-site power in the wake of the earthquake and was relying on four diesel generators to maintain cooling operations, U.S. nuclear officials said.

Seven additional nuclear plants in Virginia, Maryland, Pennsylvania and New Jersey declared unusual events, the lowest of four emergency situations. Jim Steets, a spokesman for Entergy Corp., the company that owns the Indian Point nuclear plant 50 miles north of New York City, reported "no issues" there after the quake. The plant is designed to withstand a 7.0-magnitude quake.

"As far as we know, everything is safe," said Nuclear Regulatory Commission spokesman David McIntyre.

The control towers at Kennedy International Airport and Newark Liberty International Airport were evacuated as a precaution and flights grounded as a precaution, according to a spokesman from the Port Authority of New York and New Jersey. Flights have resumed.

The U.S. Geological Survey said the earthquake struck at 1:51 p.m. at Mineral, Va., 87 miles southwest of the nation's capital. Initially, the USGS said the quake registered a magnitude 5.8 but then revised it upward to 5.9. Later in the day, USGS downgraded it back to 5.8.

The quake was the strongest in the state in 114 years, rivaling a May 31, 1897, event that occurred in Giles County, in southern Virginia. The 1897 quake was 5.9 magnitude and was centered over an area from Lynchburg, Va., to Bluefield, W.Va., and south to Bristol, Tenn.

Office workers in downtown Washington, unaccustomed to earthquakes, fled their buildings--but were uncertain what to do next. Farragut Square, just a couple of blocks from the White House, was packed. But other workers stood in the sunshine on the sidewalks outside their buildings, many trying unsuccessfully to get their cellphones to work.

Capitol Hill was less crowded than usual with Congress deep into its month-long August recess. Aides who were on Capitol Hill reported that the earthquake was strong enough to throw items off of shelves and walls.

In downtown Manhattan, reporters in the press room at the federal courthouse looked around as the building shook--and then shook several more times. Soon, they were heading down the stairs and out of the building along with the occupants of other state and federal buildings near City Hall and Chinatown.

The evacuees filled a small park north of Worth Street recounting their experiences inside as ambulance sirens blared and helicopters hovered overhead. Among those sitting on stone benches in the park were the Manhattan prosecutors who had just dropped a criminal case against former International Monetary Fund chief Dominique Strauss-Kahn.

Manhattan District Attorney Cyrus Vance Jr. had just begun a press conference regarding the dismissal of charges against Mr. Strauss-Kahn when the room started shaking. Mr. Vance told his staff everything was O.K., but he and the journalists in the room were evacuated from the building. Mr. Vance had previously been in Seattle, where earthquakes are more common.

All of the courthouses and several buildings in lower Manhattan were evacuated, leaving hundreds of people standing in open spaces away from buildings.

Amy Noller and Steve Mutton were third in line at the New York City marriage bureau when they were told they had to leave. So they ended up standing in the park, she in white her wedding dress and he in his suit.

"We were just getting ready to go into the chapel when we were told that we had to evacuate the building," said Ms. Noller. She said they didn't even feel the quake.

"We're feeling pretty gipped," she said. "We've got to call the caterer and tell them we're going to be late."

A trader on the New York Stock Exchange floor said the earthquake was noticeable, but hasn't had an impact on trading. "It felt like there was a subway train going underneath the building," said Jonathan Corpina, senior managing partner of NYSE floor broker Meridian Equity Partners. "Everything was vibrating."

All activity stopped for about 20 seconds, and then it was "business as usual" again, he said.

The Dow Jones Industrial Average pared some gains after the earthquake hit, but closed up 322 points in the trading session.

Within moments of the earthquake, Twitter lit up with news of it and the reaction of people who felt the tremors. When it seemed no real damage was done, the social media site soon filled with jokes.

Home improvement chain Lowe's evacuated a Fredericksburg, Va., store after the earthquake opened a hole in the roof, caused a pipe to break and cracked some masonry, but no employees or customers were hurt. A Lowe's spokeswoman said the company had no reports of injuries or damage from other stores, but noted phone service remained spotty.

Verizon Wireless said its network was congested for about 20 minutes following the earthquake, but said it had found no evidence of structural damage to its equipment. Mark Siegel, an AT&T spokesman said, "We have no reports of network damage but we are seeing heavy call volumes."

In central North Carolina, 130 miles south of the epicenter, the tremors sent light bulbs shaking in their fixtures, and brought people out into the street looking for a potential cause. Karen Schaefer was stopped at a traffic light in northern Raleigh when her 1995 Honda Accord began shaking.

"It felt like when you are sitting on a suspension bridge and you feel it swaying," said Ms. Schaefer, 22. "But I knew I wasn't on a suspension bridge."

Bobby Seaberry, owner of a car repair business and used car lot in Mineral, Va., the epicenter of the earthquake, was doing a brake repair job when he felt the ground rise several feet underneath him. The quake broke several windows in the tiny town, where many people ran outside to see if a train had derailed, Mr. Seaberry said.

"It felt like it went up three or four feet and vibrated and (came) right back down," he said. "It was quite a scare."

--David Wessel, Chad Bray, Michael Rothfeld, Sumathi Reddy, Dana Mattioli, Jon Kamp, Valerie Bauerlein, Steven Rusolillo, Greg Bensinger, Maxwell Murph, Mark Anderson, Elizabeth Holmes, Alan Zibel and Andrew Ackerman contrubuted to this article.

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