Protesters from Occupy D.C. march past the Washington Convention Center during a November demonstration. (NICHOLAS KAMM/AFP/GETTY IMAGES)

Rep. Darrell Issa (R-Calif.) whose committee oversees the District, said in a letter to Interior Secretary Ken Salazar on Tuesday that the Park Service had been “unresponsive” to the “overwhelming majority” of the committee’s requests for information regarding the ongoing protest at the federally-owned park.

Issa’s committee launched an investigation last month into whether the Occupy protesters are camping on federal parkland illegally and has asked the Park Service for a number of materials, including a written explanation of the difference between a “24-hour vigil” and camping out.

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