The United States was "involved" in the failed 2002 coup against Venezuelan President Hugo Chávez. However, the US role is still unknown, said on Monday US non-governmental organization National Security Archive.

Peter Kornbluh, director of Cuba and Chile documentation projects for the National Security Archive, said, "I have no doubts that the United States was involved in the coup attempt against Chávez," Efe reported in Santiago, Chile.  

The Venezuelan leader has repeatedly accused the US of being behind the plot against his government.

Kornbluh participated on Monday in the seminar "Human Rights and access to public information", held in Santiago. The researcher said that his NGO has obtained a group of documents "showing that the US, its intelligence service and its government were aware of the coup well ahead of it."