Events occurring at Assassination Time

[RJNorton]

My question is not exactly on topic, but I thought of it when I was reading this thread.

On page 280 of Theodore Roscoe's Web of Conspiracy the author discusses rumors that in a few locations in the USA people "knew" about the assassination before it occurred. Roscoe writes:

"And on the afternoon of the 14th, the Whig Press in Middletown, New York, announced that Lincoln had been killed by an assassin - one of the oddest headlines in the history of journalism."

Can it be discovered if this is true? Did the Whig Press somehow announce Lincoln's assassination before it occurred?

(The same information about the Whig Press's early announcement is on p. 145 of Jim Bishop's The Day Lincoln Was Shot.)