An earthquake with a magnitude of 4.1 has struck off the coast of Delaware, according to the US Geological Survey (USGS), with the tremors said to have been felt from New York City to Washington DC.
The earthquake was initially measured at 5.1 magnitude, before being revised down to 4.4 and then 4.1.
According to a map from the USGS, the quake was also felt in North Carolina, Virginia, West Virginia, Maryland, Delaware, New Jersey, Pennsylvania, and Connecticut.
A number of residents of various states took to Twitter to express their surprise at a rare event for the northeast.
Many, like Todd Sandler in Philadelphia were asking whether others had felt the tremors.
Another user said she felt her "entire house shake".
The quake was centred near Dover, Delaware. It jolted downtown Dover, sending workers in the statehouse to head outside to see what had happened.
It is the strongest earthquake to hit the East Coast since 2011.
There have been no reports of damage or injuries so far. There was no tsunami warning, advisory, watch or threat, according to the National Oceanic and Atmospheric Administration.
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