The Anglo-Irish independent on Tuesday asserted to Guinea's government its claim that "there has been a force majeure event under the production sharing contract (PSC) and the joint operating agreement (JOA)", Houston-based Hyperdynamics said on Wednesday.

"Tullow states in its notice that the decisions by the US Department of Justice (DoJ) and the US Securities and Exchange Commission (SEC) to open investigations into the activities of Hyperdynamics in obtaining and retaining the concession rights ...