 This was followed by Pakistan threatening the US with retaliation, if the US went ahead with unilateral action against the Haqqani network.In May 2011, Pakistani journalist Saleem Shahzad was killed and in September, "The New Yorker" reported that the order to kill Shahzad came from an officer on General Kayani's staff.In July Admiral Mullen alleged that Shahzad's killing had been "sanctioned by the government" of Pakistan, but the ISI denied any involvement in the Shahzad murder.