No other facts were available. The claim was itself the news, with updates pending a police investigation. This isn't complicated. Investigating crimes is the police's job, not every single newspaper in the world's.
Should all of the world's newspapers have held off on reporting the MAGA bombs until Cesar Sayoc's conviction?
Should we all have pretended that nothing was wrong about the world trade center until the 9/11 commission filed their final report?