At least seven journalists and activists who have been vocal critics of the Kremlin and its allies have been targeted inside the EU by a state using Pegasus, the hacking spyware made by Israel’s NSO Group, according to a new report by security researchers.

The targets of the hacking attempts – who were first alerted to the attempted cyber-intrusions after receiving threat notifications from Apple on their iPhones – include Russian, Belarusian, Latvian and Israeli journalists and activists inside the EU.

Pegasus is considered one of the most sophisticated cyberweapons in the world, and is operated by countries who acquire the technology from NSO. The company says it is meant to be used for legitimate reasons, such as fighting crime. But researchers have documented hundreds of cases in which operators of the spyware, including states inside the EU, have allegedly used it for other purposes, including spying on political opponents and journalists.