Pokemon GO is currently experiencing server issues which have also been confirmed by Niantic's own help account on Twitter.
Currently, any trainers attempting to login using the games Pokemon Trainer Club login are unable to do so
"We're currently investigating reports that Trainers using Pokémon Trainer Club are encountering login issues." Niantic Help told followers within the lasy 15 minutes.
Whilst these problems are ongoing, it should be noted that the standard Google login for the game, appears to be unaffected by the recent server login problems.
There have also been countless offline reports on Down Detector, which measures outage stats for popular apps, websites and online services.
According to Down Detector, these issues appear to be impacting players across the globe, with reports in the UK, US, Europe and in the east near Japan.
These issues started at around 9pm, but Niantic has yet to say how long the game could be impacted.