In 2017 in Lappeenranta, Finland, attackers caused heating systems to go offline by targeting them with a Distributed Denial of Service (DDoS) attack, leaving residents to face the sub-zero temperatures typical for that time of year.

In 2016, the U.S. Department of Justice charged seven Iranians for hacking the control systems of a small dam in New York State in 2013. The dam was offline for repair, preventing the hackers from controlling the flow of water.

https://www.securitymagazine.com/articles/88847-the-unstoppable-convergence-between-physical-and-cybersecurity