Sony Pictures was hit by a hack that forced employees to shut down their computers Monday and stay off the film studio's network, according to reports.

Sony Pictures, the film and TV arm of Japanese tech and media conglomerate Sony, was hacked at some point in the last two days by a group calling itself #GOP, reported The Hollywood Reporter, citing people within the studio. The hackers claimed to have obtained Sony Pictures' internal data, including its "secrets," and said they would release the data to the public if their demands were not met, according to reports. It is unclear what the hacker group is demanding.

Sony has kept quiet on the incident, saying only that it is investigating an "IT matter." Sony did not immediately respond to CNET's request for comment.

Sony Pictures employees were told Monday to shut down computers and not access corporate networks or email, as well as disable Wi-Fi on all mobile devices, reported Variety. It is unclear if Sony Pictures, which has produced films such as "The Amazing Spider-Man" and TV shows including "Shark Tank," was the target or if the hackers were attempting to go after Sony Corp. Sony Pictures Animation, Sony Music Entertainment and other parts of Sony Corp. were not affected by the hack, reported the Los Angeles Times.