A hacking group has claimed responsbility for taking down the Pokémon Go servers using a DDOS attack.
A DDOS, or Distributed Denial of Service, is a way troublemakers crash servers by flooding them with so many requests every second that they cannot cope.
A cyber collective known as PoodleCorp announced on Twitter it was behind the action, but this claim is yet to be verified.
The account also retweeted a post by a user claiming to be the leader of PoodleCorp.
PoodleCorp has recently targeted high profile YouTubers such as Pewdiepie.
Pokémon Go servers also crashed earlier in July soon after launching, due to unprecedented demand.