The Federal Investigation Agency has registered a case against the former prime minister and PTI chief Imran Khan for allegedly losing the US cipher.

Sources said that Khan has been nominated in the case registered by the Anti-terrorism wing of the FIA on Tuesday.

Meanwhile, the former principal secretary Azam Khan arrived at the FIA headquarters after he was summoned by the Joint Investigation Team which is investigating the matter related to the US cipher which Khan had said was the reason for his ouster.

Read: Cipher not missing as its original copy is in Foreign Office: Imran Khan

Sources said that FIA officials investigated the former prime minister in the Attock Jail regarding the alleged disappearance of the cipher. The JIT members of FIA met the PTI chief in the office of the deputy superintendent of Attock jail.

Khan’s former Principal Secretary Azam Khan turned witness against him and filed a statement regarding the ‘cipher’ controversy before a magistrate on July 19.

Azam Khan has said that Imran planned to use the cipher to create a political narrative against his opposing political parties as well as the establishment.

The statement, released to the media in written form, claims that Imran was ‘euphoric’ when he saw the cipher and called it a ‘blunder’ by the United States.