The waiting game for the release of until now secret files into the assassination of US President John F. Kennedy is continuing with nothing yet issued from the White House or the National Archives.
Much of Thursday has now passed leaving it unclear how the US government will comply with a law requiring the records into Kennedy's November 22, 1963 killing in Dallas to come out by the end of the day.
US President Donald Trump has been under pressure from intelligence agencies to keep some of the 3,100 files off limits, as he is permitted to do under certain circumstances by the 1992 law.
About 30,000 documents have already been released with redactions.
Asked what he meant, Sabato emailed to say: "Contradictory signals were given all day. Trump's tweets led us to believe that disclosure was ready to go. Everybody outside government was ready to move quickly."
Trump was a bit coy about the scheduled release on the eve of it, tweeting: "The long anticipated release of the #JFKFiles will take place tomorrow. So interesting!"
Experts say the publication of the last batch of evidence could help allay suspicions of a conspiracy - at least for some.
A law from 25 years ago requires the government to put the thousands of documents out by this date, though some may stay hidden.
For historians, it's a chance to answer lingering questions, put some unfounded conspiracy theories to rest, perhaps give life to other theories - or none of that.
Earlier this year the Archives said it could not judge the relevancy of the documents but said it assumed they would be "tangential" to what is known about the assassination.
Interest is intense but it is possible that as this chapter of history comes alive, it might quickly fall back into temporary invisibility. Servers are bound to be stressed by people looking for the online-only files.
Some non-government websites specialising in JFK records were difficult to access on Thursday morning.
Experts say the publication of the last trove of evidence could help allay suspicions of a conspiracy - at least for some.
"As long as the government is withholding documents like these, it's going to fuel suspicion that there is a smoking gun out there about the Kennedy assassination," Patrick Maney, a presidential historian at Boston College, said.
