UPDATED – 5.8 East Coast earthquake centered in Mineral, Virginia. Damage in Nation's Capital.

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From WUSA9.com:

One of the strongest earthquakes ever recorded on the East Coast shook buildings and rattled nerves from South Carolina to New England on Tuesday and forced the evacuations of parts of the Capitol, White House and Pentagon.

Skyscrapers swayed in New York, and frightened workers spilled into the streets. The National Cathedral in Washington said its central tower and three of its four corner spires were damaged.

There were no immediate reports of deaths, but fire officials in Washington said there were at least some injuries. The U.S. Geological Survey said the quake registered magnitude 5.8 and was centered 40 miles northwest of Richmond, Va.

The White House said advisers told President Barack Obama there have been no reports of major damage to the nation's infrastructure, including airports and nuclear facilities.

Two nuclear reactors at the North Anna Power Station, in the same county as the epicenter, were automatically taken off line by safety systems, said Roger Hannah, a spokesman for the U.S. Nuclear Regulatory Commission.

The earthquake came less than three weeks before the 10th anniversary of the Sept. 11 attacks, and in both Washington and New York it immediately triggered fears of something more sinister than a natural disaster.

At the Pentagon, a low rumbling built until the building itself was shaking, and people ran into the corridors of the complex. The shaking continued there, to shouts of "Evacuate! Evacuate!"

The Park Service closed all monuments and memorials on the National Mall, and ceiling tiles fell at Reagan National Airport outside Washington. All flights there were put on hold.

The National Cathedral said cracks had appeared in the flying buttresses around the apse at one end. "Everyone here is safe," the cathedral said on its official Twitter feed. "Please pray for the Cathedral as there has been some damage."

Metro says all trains are running at reduced speeds and crews are conducting track inspections. MARC officials say all train service is suspended until Amtrak and CSX crews are able to inspect the tracks and declare them safe.

9NEWS NOW's Derek McGinty was standing outside the Martin Luther King, Jr. Memorial when he says, "The stones underneath our feet began to move." He said people were asking, "Did you feel that, did you feel that," and "This is God letting us know he's still in charge."

9NEWS NOW's Kristin Fisher was on the 11th floor of her building in Clarendon and "felt tremendous swaying."

One person who was in an office building near 14th St. and New York Ave. told 9NEWS NOW's, "A little bit before 2 o'clock, I felt the building shaking, but it was mild, but then I felt another shake and that was strong."

The Washington Nationals have not made a decision about tonight's game and are delaying the opening of the gates.
Federal Emergency Management Agency Spokesperson Rachel Racusen issued the following statement on the earthquake that impacted the mid Atlantic Region and other states today:

"According to United States Geological Survey (USGS), the mid Atlantic Region of the United States experienced a 5.9 magnitude earthquake. FEMA, along with the entire federal family, is closely monitoring the situation and is in close contact and coordination with our partners in the National Capital Region and our state partners. Though there are no early reports of major damage or requests for assistance at this time, preliminary damage assessments are currently taking place in all affected states and we will continue to work closely with their emergency management officials.

"Due to overload of cell phone usage, there are reports of cell phone congestion. We request that members of the public use email or text messages if possible to communicate for the next few hours, except in cases of emergency, so that emergency officials can continue to receive and respond to urgent calls. We encourage everyone in the affected areas to listen to the direction of their local officials. More information will be provided as it becomes available."

In lower Manhattan, the 26-story federal courthouse in lower Manhattan, blocks from ground zero of the Sept. 11 attacks, began swaying, and hundreds of people streamed out of the building.

The New York police commissioner, Raymond Kelly, was in a meeting with top deputies planning security for the upcoming anniversary when the shaking started. Workers in the Empire State Building spilled into the streets, some having descended dozens of flights of stairs.

"I thought we'd been hit by an airplane," said one worker, Marty Wiesner.

Another, Adrian Ollivierre, an accountant, was in his office on the 60th floor when the quake struck: "I thought I was having maybe a heart attack, and I saw everybody running. I think what it is, is the paranoia that happens from 9/11, and that's why I'm still out here — because, I'm sorry, I'm not playing with my life."

Shaking was felt as far south as Charleston, S.C., and as far north and east as Martha's Vineyard, Mass., where Obama is taking summer vacation and was starting a round of golf when the quake struck at 1:51 p.m. EDT.

Obama led a conference call Tuesday afternoon on the earthquake with top administration officials, including his homeland security secretary, national security adviser and administrator of the Federal Emergency Management Agency.

A magnitude of 5.8 would make the quake among the most powerful to strike the eastern United States. In 1897, a magnitude-5.9 quake was recorded at Giles County, Va., the largest on record in that state.

East Coast earthquakes are far less common than in the West, but they tend to be felt over a broad area.

"The waves are able to reverberate and travel pretty happily out for miles," said U.S. Geological Survey seismologist Susan Hough.

Amtrak said its trains along the Northeast Corridor between Baltimore and Washington were operating at reduced speeds and crews were inspecting stations and railroad infrastructure before returning to normal.

More than 12 million people live close enough to the quake's epicenter to have felt shaking, according to the Geological Survey. The agency said put the quake in its yellow alert category, meaning there was potential for local damage but relatively little economic damage.

The USGS said the quake was 3.7 miles beneath the surface.

The Virginia quake came a day after an earthquake in Colorado toppled groceries off shelves and caused minor damage to homes in the southern part of the state and in northern New Mexico. No injuries were reported as aftershocks continued Tuesday.

In Charleston, W.Va., hundreds of workers left the state Capitol building and employees at other downtown office buildings were asked to leave temporarily.

"The whole building shook," said Jennifer Bundy, a spokeswoman for the state Supreme Court. "You could feel two different shakes. Everybody just kind of came out on their own."

In Ohio, where office buildings swayed in Columbus and Cincinnati and the press box at the Cleveland Indians' Progressive Field shook. At least one building near the Statehouse was evacuated in downtown Columbus.

In downtown Baltimore, the quake sent office workers into the streets, where lamp posts swayed slightly as they called family and friends to check in.

Twitter and Facebook lit up with reports of the quake.

"People pouring out of buildings and onto the sidewalks and Into Farragut Park in downtown DC," Kevin Madden, a Republican strategist, posted on Twitter.

John Gurlach, air traffic controller at the Morgantown Municipal Airport was in a 40-foot-tall tower when the earth trembled.

"There were two of us looking at each other saying, `What's that?"' he said, even as a commuter plane was landing. "It was noticeably shaking. It felt like a B-52 unloading."

Immediately, the phone rang from the nearest airport in Clarksburg, and a computer began spitting out green strips of paper — alerts from other airports in New York and Washington issuing ground stops "due to earthquake."