Government officials have blamed Russian and Belarusian hackers and cast doubt over the authenticity of the leaked correspondence, which included email exchanges with Morawiecki and government advisers.
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Two opposition lawmakers who notified prosecutors about the leaks said they were informed that a probe was launched into one of the email threads. They said the investigation relates to Dworczyk's communications with his defense adviser, who provided him with information about weapons, some of which was described as "top classified." Poland is a NATO member.
Prime Minister of the Republic of Poland Mateusz Morawiecki attends a briefing in Kyiv, Ukraine. An investigation into the hacked email mailbox of an aide to Morawiecki has been opened. The aide resigned last year. (Volodymyr Tarasov / Ukrinform/Future Publishing via Getty Images))
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The opposition lawmakers said the decision by prosecutors to open the investigation last week confirmed that the hacking of Dworczyk's mailbox was a major issue and the leaked emails were genuine.
"The state has officially said the matter is confirmed and serious," said Cezary Tomczyk of the Civic Platform party.
Tomczyk and another lawmaker, Adam Szlapka, said high officials discussing classified matters in correspondence from private email accounts without adequate security compromised Morawiecki’s government and the ruling Law and Justice party.