A day after players complained about the server outage of popular augmented reality (AR) game Pokemon Go, hacking group OurMine, which also compromised social media accounts of many celebrities, on Monday took responsibility of hacking the game servers.

The hacking team hit Pokemon Go’s login servers with a distributed denial of service (DDoS) attack leaving some players frustrated as they were unable to log in to the game, technology website TechCrunch reported.