New York has been shaken by an earthquake as tremors also felt in Delaware and Baltimore.
The quake is believed to have measured 5.1 on the Richter scale.
Experts from the US Geological Society say the quake was reported 10km east-northeast of Dover in Delaware.
It happened shortly before 5.50pm local time.
There are no details yet on injuries or damage suffered as a result.
Baffled Americans reported shakes for miles around the epicentre, and took to social media to find out what was going on.