Jetstar flights have been grounded all flights and closed all check-in desks, nationwide.

It comes after Telstra confirmed that a fire at one of their exchanges has left customers without service. It is affecting both mobile and fixed-line services.

Update: Jetstar confirms self check-in counters down across the country because of Telstra outage. https://t.co/YSQqtRuUwL @newscomauHQ

— Rohan Smith (@Ro_Smith) February 2, 2017

The incident happened at their Chatswood exchange

It is now known when the issue will be resolved.