(NBC NEWS) Secretary of State Hillary Clinton was hospitalized Sunday after doctors discover a blood clot had formed, the State Department said in a statement.

Philippe Reines, a State Department senior advisor, said in the statement that the clot stems from a concussion she sustained several weeks ago.

Reines said Clinton is being treated with anti-coagulants at New York-Presbyterian Hospital. She will be monitored there for the next 48 hours, he said.

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