Cooling pump failure lead to water leaking into the UPS room. Batteries caught fire and firefighters can't access the room. Fire is contained although.

(this was at ~10-11 am GMT+2 time)

Edit:

Fire is extinguished (~3pm GMT+2)

https://www.mail-archive.com/frnog@frnog.org/msg72320.html

https://www.mail-archive.com/frnog@frnog.org/msg72323.html

https://www.mail-archive.com/frnog@frnog.org/msg72327.html