Both hospitals are part of the Hackensack Meridian Health system - Pascack Valley Medical Center in Westwood, New Jersey, and Mountainside Medical Center in Montclair.
There are no details on what the cybercriminals are demanding.
Hackensack Meridian issued a statement saying, "As a precaution, our emergency rooms are currently on divert status. There is no adverse impact on patient care."
There is no mention of when the ERs might open.
ALSO READ | No gas for Thanksgiving, NYCHA offers tenants $15 gift cards
NYCHA offers tenants 15 gift cards after four-month gas outage
----------
* Get Eyewitness News Delivered
* More New Jersey news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube
Submit a tip or story idea to Eyewitness News
Have a breaking news tip or an idea for a story we should cover? Send it to Eyewitness News using the form below. If attaching a video or photo, terms of use apply.