A minor earthquake shook residents awake in the DC area early Friday.
The quake hit at 5:04 a.m. EDT and had a magnitude of 3.6.
The quake was centered in the Rockville, Md., area said Randy Baldwin, a physicist with U.S. Geological Survey's National Earthquake Information Center.
Police in Washington and in nearby Montgomery County, Md., said there were no immediate reports of injuries or damage.
On the U.S. Geological Survey's website, people as far away as Pennsylvania and West Virginia reported feeling the quake.