An earthquake with a preliminary magnitude of 5.9 struck Tuesday afternoon near Washington, D.C., the U.S. Geological Survey said.
The epicenter was in Mineral, Virginia. The quake was four miles deep, according to the USGS. Did you feel it? Send CNN an iReport.
To get complete coverage and all the latest updates, click on CNN's main story here. View a CNN Open Story about the quake. CNN Open Story combines iReports with reports from CNNers across the globe on a map and timeline.
Update 3:36 p.m. ET: Terminal A at Washington Reagan National Airport has been evacuated because of an odor of gas, airport spokeswoman Courtney Mickalonis said. Initial sweeps of the building showed no major damage from the earthquake.
Light structural damage has been reported in Culpepper and Orange counties in Virginia, said Laura Southard of the state Emergency Operations Center. She said there have been no reports of injuries in Virginia.
Update 3:28 p.m. ET: The White House and adjacent buildings evacuated as a precaution following the earthquake have been given the all-clear, the U.S. Secret Service said. The FBI and Justice Department have also reopened evacuated buildings.
Update 3:25 p.m. ET: East Coast residents should be prepared to feel aftershocks from Tuesday's earthquake, a U.S. Geological Survey official said.
Update 3:22 p.m. ET: The North Anna nuclear power plant, located 20 miles from the epicenter, is shut down and in a safe condition, a company official and the Louisa County public information office report. There has been no release of nuclear material, Louisa County spokeswoman Amanda Reidelbach said.
Update 3:04 p.m. ET: All national monuments and parks in Washington are "stable but closed" following Tuesday's earthquake, a United States Park Police spokesman Sgt. David Schlosser said. A couple of minor injuries and some minor structural damage have been reported in Washington, following Tuesday's earthquake, according to Schlosser.
Part of the central tower of the National Cathedral, the highest point in Washington, was damaged, according to spokesman Richard Weinberg. "It looks like three of the pinnacles have broken off the central tower," Weinberg told CNN.
Update 3:02 p.m. ET: Amtrak is reporting service disruptions between Washington and Baltimore because of the earthquake, the company reported on Twitter.
Aftershocks are a concern, U.S. Geological Survey seismologist Lucy Jones told CNN. "People should be expecting (them), especially over the next hour or two," she said.
The quake was felt in Philadelphia, Pennsylvania; New York City and on Martha's Vineyard, Massachusetts, where President Barack Obama is vacationing. It's unknown if the president felt the quake.
The Pentagon has been evacuated, CNN's Barbara Starr reports. "When the building began shaking rather violently, hundreds of people began streaming out," she said, because many people thought that the building was under attack. Starr was standing in the Pentagon's press office when the roof started to shake.
Cell phone service has been disrupted in New York City, CNN learned within minutes of the quake.
Updated 2:47 p.m. ET: A "considerable amount" of water from a water pipe has flooded two corridors of the Pentagon, according to an announcement in the building. People who work in those areas are being asked to stay in their offices while workers try to repair the damage.
The National Cathedral in Washington is damaged, CNN has confirmed.
And Dominion Generation, which operates the North Anna nuclear power station in central Virginia a few miles from the epicenter of the earthquake, is trying to reach operational staff at the plant, according to a company spokesman. Landlines to the plant appear to be down.
Shortly after the quake struck, traders in the New York Stock Exchange also felt the quake and shouted to each other, "Keep trading!" CNN's business correspondent Alison Kosik reported from the floor at 2:20 p.m. E.T.
Twitter traffic suggests the quake was felt all over the East Coast.
In Philadelphia, HunterPence3 tweeted, "Wow Earthquake just shook the entire locker room!"
In Cleveland, "tribeinsider" wrote "I'm no expert but i think we just had an earthquake here."
And even in Toronto, Canada, tweets said that the shaking could be felt for minutes.
Pete Krech, who works at a business in Fredericksburg, Virginia, likened the sensation to being on a jolting amusement ride. "I was receiving a supply truck," said Krech, store manager at Mattress Warehouse of Fredericksburg, south of Washington. "I felt a vibration under my feet."
Brendan Wein, a sales representative at Hoffman Nursery in Roxboro, North Carolina, said he thought there was a helicopter flying above his work building. "I was literally shaking in my chair," he said.
CNN iReporter Jeff Yapalater said he was in his backyard in New York's Long Island when the earthquake hit. "Suddenly I felt this light swaying of the Earth. I'd never felt that before, so I thought maybe I was experiencing vertigo for a moment, and it lasted maybe 30 seconds ... We're feeling this really far away!" he wrote.
Felt In Conway, SC! Small shake
Good grief! I get email briefings at least three times a week about earthquakes in the Pacific Rim (I live on the Pacific Ocean). Most of them are at least 5.0, most are in Alaska. I get these briefings because of the possibility of tsunamis on the west coast. We were watching the Libyan War and all of a sudden it is a huge deal about some little, itty bitty earthquake on the east coast. The east coast is a bunch of babies! You think you are the only people on earth! Just stay out of buildings through the aftershock period. Then get back to your lives!
here in jefferson new jersey we felt the quake i was laying on the ground and my was was on the bed than we heard noises and the shaing was tremendous first we thought it was my little brother but it wasn't every single thing it the room was shaking i got very scared it lasted about like 30 40 seconds.
Whole 5 story building in Stamford, CT shook!
felt it in Stamford, CT. Plants shook, chairs moved, building swayed and its only 2 stories high – very scary
Wasn't there a similar earthquake reported in Colorado yesterday?
Shook the entire house in Cornelia, GA.
Manassas, VA, Shook the building I was in, but wasn't that bad
On the 12th floor of my apt in nyc, working on my computer (who wasn't!) when I notice my chair moving and monitor tilting. I thought I was having a dizzy spell! But then I heard my doors creaking as they moved and saw jewelry on a door knob swinging! It lasted a couple of minutes and I really felt the thing! Soooo glad i don't live on west coast.
Live in newport news VA and didnt think much of it...Walls shook but no damage
felt in Pittsburgh, thought I was getting dizzy!
WE FELT IT IN LYNCBURG, VA..SCARED US TO DEATH..WINDOWS WERE SHAKING, FLOORS WERE SHAKING...VERY SCARY
Here in Richmond, VA– thought it was a plane coming through the house then grabbed twin boys and got out. All our neighbors were outside as well. The walls and floor shook but nothing fell.
felt in woodbridge va..scary top floor of office building, freaked me out....
Got some good vibrations here in LIncolnton, NC!