On July 20, 2023, a ransomware attack nearly completely encrypted all of the city of Hayward's operations aside from vital services like law enforcement and healthcare, forcing the city to declare a state of emergency.
Source: https://therecord.media/california-city-el-cerrito-investigates-data-theft-lockbit
"id": "CIT4128823",
"linkid": "city-of-hayward",
"type": "Ransomware",
"date": "07/2023",
"severity": "100",
"impact": "5",
"explanation": "Attack threatening the organization’s existence"