By Alexandra Berzon And David Enrich 

A lawyer representing Sony Pictures Entertainment Monday asked Twitter Inc. to suspend the account of a user who posted more than 50 internal company documents released by hackers as part of a massive cyberattack on the studio.

The letter to Twitter, sent by well-known attorney David Boies, is similar to ones Mr. Boies sent to news organizations last week on behalf of Sony Corp.'s entertainment unit.

Many news organizations have used emails to and from Sony Pictures motion picture head Amy Pascal, Sony Entertainment CEO Michael Lynton and other senior executives, in addition to contracts and other documents, as fodder for stories.

In those cases, Mr. Boies said the outlets weren't allowed to use "stolen" information and threatened that they may be responsible for damages incurred by Sony that were related to the reports. Media attorneys have said that the law allows news outlets to report on information in the public interest regardless of its origins.

A Sony representative had no comment. Mr. Boies didn't immediately respond to a request for comment.

On Monday, Twitter said it had received the letter from Mr. Boies and shared it with one of its users, but had no further comment. The social-media company occasionally receives such letters from governmental bodies and generally shares them with the targeted user.

The Twitter user targeted by the letter is musician Val Broeksmit, whose Twitter handle is @bikinirobotarmy, also the name of his band. Mr. Broeksmit since Dec. 13 has posted on Twitter more than 50 images that came from the hacks, including a Sony movie-release schedule and emails from Brad Pitt, producer Scott Rudin and Ms. Pascal.

On Dec. 19, Twitter told Mr. Broeksmit by email that his account had been suspended due to a complaint over a single tweet, which appeared to be focused on an Oliver Stone film about Edward Snowden, according to a copy of the email reviewed by The Wall Street Journal.

That tweet was later deleted and Mr. Broeksmit's account was reactivated, according to a follow-up email sent the same day.

On Monday, Twitter forwarded Mr. Broeksmit the letter it had received from Mr. Boies stating that Sony would hold Twitter accountable for damages if it didn't suspend Mr. Broeksmit's account and destroy all of the internal Sony documents.

Twitter didn't tell Mr. Broeksmit to take the tweets down, but said it couldn't provide him with legal advice and suggested he get a lawyer, according to Mr. Broeksmit.

Mr. Broeksmit said he was surprised by the letter. "It's crazy," he said. "If this can happen to me, it can happen to anybody."

Yoree Koh and Ben Fritz contributed to this article.

Write to Alexandra Berzon at alexandra.berzon@wsj.com and David Enrich at david.enrich@wsj.com

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