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.
It was felt in Charleston, WV. Was scarey to me, I've never felt a trimmer before!
We felt it in Dover, DE!
Not in LA.
Our 4-story office building shook and we were evactuated. Danville, PA (Montour County)
felt here on new hyde park,long island
Felt it here in Springfield, MA and Chicopee, MA
Indianapolis felt it!
For All those posting that it's no big deal.... if you have never felt an earthquake, it is a big deal. Specially for those of us who are preparing for Hurricane Irene! Nothing to joke about!
Made 'waves' in my water bottle. Auburn Hills, MI.
We felt it in Williamsburg, and thought I was going to get seasick. Please no more to come!!!
Louisa County, VA is in CENTRAL Virginia, not NORTHERN Virginia. If you check with the USGS, it was a 5.9 on the Richter scale and was less than a km deep.
There's a nuclear plant at the epicenter... North Anna Power Station.
Felt it in Providence, Rhode Island! First quake felt in my 46yrs of living! Was sitting at my desk in a brick office bldg when I felt dizzy like I was swaying back and forth for about 15 seconds. All the office was a buzz with their stories of swinging lamps and pictures moving on walls. No real damage as I can tell; just very exciting!!!
Office in DC shook for about 30 seconds... no damage, but everyone a little rattled thinking the worst...
I live in Kermit wv, mingo co and I felt the eathquake , I was on the phone with my sister in law and sittin on the bed and it felt as if someone was pickin my bed up shaking it so i raised up and looked over and my big mirrors on the wall was weavin back and forth.. and i was freaking out telln my sister in law to this as it was happening it seemed as if the mirror shook forever and then when that stop it was like my cieling was popping.. then i was on facebook and my cousin who lived in lenore wv mingo co instant messages me then ask me amy did u just feel that earthquake i was like ow my lord it that what it was cause me and my sister in law was trying to figure out what it was like and explosion somewhere maybe ... but i told her i believe it was an earthquake .. and just so happen it was i am freakin out here so eari....so scary ,,,