A hacking group has claimed responsbility for taking down the Pokémon Go servers using a DDOS attack.
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.
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PoodleCorp @PoodleCorp
PokemonGo #Offline #PoodleCorp
6:24 PM - 16 Jul 2016
2,341 2,341 Retweets 3,008 3,008 likes
"Just was a lil test, we will do something on a larger scale soon," said the post by user XO.
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PoodleCorp has recently targeted high profile YouTubers such as Pewdiepie, according to Gearnuke.
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.
On Saturday, users across the US and Europe complained they were unable to access the game, or that it was freezing.
When news spread of the attack, players took to social media to voice their outrage.
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iriekoru @iriekoru
@Boogie2988 Francis you were having too much fun on #pokemongo so a hack group took down the servers for you!
9:11 PM - 16 Jul 2016
Retweets 1 1 like
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Meg Bethany Read @triforcemeg
I'm really pissed off that Pokémon Go is down because a group of killjoys decided it would be fun to hack the servers and take them offline.
9:10 PM - 16 Jul 2016
21 21 Retweets 53 53 likes
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mil @rnilosan
when you have to stop playing pokemon go because a bunch of crustyass edgy crybabies don't like people enjoying it so they hack it 4 THE LUL
9:10 PM - 16 Jul 2016
34 34 Retweets 51 51 likes
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Rachel A @RachelAnders66
Why would someone hack the #PokemonGO servers and make the game go down? I don't get it and I really want to catch them all! #😫 #whyyy
9:13 PM - 16 Jul 2016
5 5 Retweets 12 12 likes
Pokémon Go servers also crashed earlier in July soon after launching, due to unprecedented demand.
The incident is one of many international news stories relating to the game since its launch earlier in July.
A man crashed his car into a tree in New York on Friday, later admitting to police he had been distracted by the game.
On Thursday two men in San Diego fell off a cliff after they climbed over a fence in an attempt to catch the animated characters.