Right after the news broke, I took some screen shots from DuckDuckGo News results for "Florida school shooting" at 6:01PM EST on Feb 14 (converted from my time zone 14 hours ahead in case you wonder about the files' creation date).
It appears WaPo, Bradenton Herald and U-T San Diego (interesting that shooter was wearing SD shirt in school photo) put out their articles around 3-7am, instead of waiting until the shooting actually happened…