Note the date in the photo caption of this Ottawa Citizen front page image from April 7:

Here’s the resulting correction that ran Sunday:
RMS Titanic struck an iceberg and sank in the Atlantic Ocean in 1912. An incorrect date appeared in Saturday’s Citizen.
The full front page with the photo (click for larger):

Thanks for Garey Ris for pointing this out.
Related: How The New York Times invented disaster coverage with Titanic sinking (Poynter)

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