For what it is worth ABC reports the attack was cancelled due to fears of civilian casualties which I find hard to believe. Did they not see the risk to civilians as they made the plan to begin with?
That does sound hard to believe. I would expect military installations to be the primary targets with relatively few military personnel present much less civilians.
Alternatively, the strike might have been intended for leadership which might incur some civilian casualties but can’t imagine they would call it off for that. If that’s who you want to hit you hit them.
Of course any speculation depends on believing the reports.