BBC News Published image captionDozens of Al Jazeera journalists were targeted in the attack, researchers allege Dozens of Al Jazeera journalists were allegedly hacked with the help of spyware developed by Israeli firm NSO Group, cyber-security researchers say. It says a vulnerability in iPhone operating system software was used. NSO Group has denied the allegation, saying it “lacks any evidence". Citizen Lab researchers say they concluded with “medium confidence” that two attackers who had spied on the phones of Al Jazeera journalists were doing so on behalf of the Saudi Arabian and UAE governments. “The phones were compromised using an exploit chain that we call Kismet,” the researchers write.