A minor earthquake rattled the Washington, D.C., area early Friday morning.

The 3.6 temblor was centered in Rockville, Md., according to Randy Baldwin, a physicist with U.S. Geological Survey's National Earthquake Information Center.

The quake, which struck at 5:04 a.m. EDT, shook homes and rattled windows. Gaithersburg resident Brett Snyder, however, seemed unfazed.

"It happened very instantaneously and then off to a day's work," Snyder said.

Police in Washington and in nearby Montgomery County, Md. said no damage or injuries have been reported.