The FBI says (PDF) Iran-linked hackers disrupted internet-connected systems used by U.S. oil, gas, and water companies. Even with the recent two-week ceasefire between Iran and the United States and Israel, hackers backing Tehran say they won't end their retaliatory cyberattacks. The Hill reports: The report warned that similar companies across the country should be aware of an increased push by hackers to take over programmable logic controller (PLC) systems, which can be used to digitally con…