Twitter has been forced to reveal information about the source of a tweet saying people were going to die at the Broadway theatre staging a one-man show by former heavyweight champion Mike Tyson.
The New York Police Department issued a subpoena after Twitter refused to cooperate in an investigation into posts that referenced the fatal shooting of 12 people last month at a showing of The Dark Knight Rises at a Colorado cinema.
Police said the tweets appeared to be aimed at the audience for Mike Tyson: Undisputed Truth - the solo show directed by Spike Lee at the Longacre Theatre in Manhattan.
"This suit ain't no joke yo I'm serious people are gonna die just like in aurora," police said one tweet read. Another from the same account warned: "I'm in Florida rite now, but it'll happen i promise I'm just finishing up my hit list."
Before complying with the subpoena, Twitter had told the NYPD in an email, "We appreciate the timeliness and sensitivity of this matter, and have reviewed the reported Twitter account.
"While we do invoke emergency disclosure procedures when it appears that a threat is present, specific and immediate, this does not appear to fall under those strict parameter as per our policies."
A police spokesman said security had been stepped up at Longacre as a precaution.