The hacking mystery roiling the Italian prime minister Giorgia Meloni’s rightwing government is deepening after researchers said they had found new evidence that two more journalists were targeted using the same military-grade spyware that Italy has admitted to using against activists.

A parliamentary committee overseeing intelligence confirmed earlier this month that Italy had used mercenary spyware made by Israel-based Paragon Solutions against two Italian activists.

But the same committee, which launched an investigation into the hacking scandal in March, said it had been unable to determine who was behind the targeting of a prominent Italian investigative journalist, Francesco Cancellato, whose news outlet has been critical of the Meloni government.

Now a report by researchers at the Citizen Lab has revealed that a close colleague of Cancellato, Ciro Pellegrino, who is head of the investigative outlet Fanpage.it’s Naples bureau, was also targeted by a user of Paragon Solution’s spyware, which is called Graphite. The Citizen Lab said a third journalist, who chose to remain anonymous and is described as a “prominent European journalist”, had also been targeted with the spyware, it said.