The Luas website has been taken down this morning, after a hacker left a message for the transport system.
Before the page was removed from the web, when customers went to the website, the usual information didn't appear.
Instead a message showed up saying that if one bitcoin wasn't deposited within five days, their data would be released.
The text read: "You are hacked. Some time ago I wrote that you have serious security holes."
"You didn't reply, the next time someone talks to you, press the reply button."
"You must pay 1 bitcoin in 5 days, otherwise I will publish all data and send emails to your users."
The hacker then left an address for the bitcoin to be deposited to.
Due to an ongoing issue, please do not click onto the Luas website. We currently have technicians working on the issue. We will be using this forum only for travel updates should the need arise. For any queries, please contact our customer care number on 1850 300 604.
— Luas (@Luas) January 3, 2019
On Twitter, Luas have asked customers to call 1850 300 604 if they require any information or have queries.
They ask for passengers not to click onto the Luas website, and they are working to resolve the issue.
It's never a quiet moment on the Internet.