Confessed Pakistani-American terrorist David Headley, who planned a murderous attack on the Copenhagen office of Jyllands-Posten newspaper, was working with the "assistance" of a network of European contacts and supporters, according to new information released by American prosecutors.

Headley, a naturalised US citizen born in Pakistan as Daood Sayed Gilani, has been in prison in Chicago since December 2009, along with Tahawwur Rana. In March 2010, Headley confessed his involvement in the 2008 terrorist attacks in Mumbai, India, and to planning a terrorist attack against Jyllands-Posten, in revenge for the 2005 Mohammed cartoons.

As part of his plea bargain, Headley agreed to cooperate with authorities in the US, India, Pakistan and Denmark, reports The New York Times. Rana, who pleaded not guilty, is awaiting trial next month in Chicago.

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