The Black Desert Online forum has a post that contains an ongoing timeline of a DDOS attack on game servers that started in the wee hours of the morning. Approximately 20 minutes ago, BDO staff revealed that measures have been implemented to combat the DDOS, though it remains unknown if the issues are solved at this time.
The original message:
We have acknowledged that NA servers are currently down, we are investigating on the issues promptly. For any further updates regarding this matter, please be sure to stay tuned to this thread. Please accept our apologies for the unexpected inconvenience this may cause, and hope to get NA server functional as soon as possible. Thank you for your understanding.
Check this Black Desert Online thread to keep track of the conversation.
Thanks to our anonymous tipster!