Despite promising to help determine what happened with the hacks targeting journalists and activists in Italy, Israeli American spyware maker Paragon has reportedly not responded to authorities’ requests for information.

The acting director of U.S. Immigration and Customs Enforcement told lawmakers that the use of Paragon spyware is necessary to counter terrorists’ “thriving exploitation of encrypted communications platforms.”

Italian authorities are making progress in their investigation into a wide-ranging spyware scandal in Italy involving Paragon spyware. But the mystery of who hacked two Italian journalists with Paragon spyware continues.