Is it possible first officer inadvertently averted a worse major planned attack?
Just speculating. T
Again, if you take all the facts before the investigation is over, there is a puzzle.
Officer shot was on foot in a cemetery looking for bad guys, he was tasked with taking bad guys off the street, probably identified a possible suspected and before he had a chance to do anything he was shot, hence the reason why he never even called for backup. Once the perps realized their cover has blown cop they had no choice but to shoot, once they're cover was blown they had to take action and execute their plan.
All speculation but makes sense based on the facts.
See pic of in store, seems like a ring camera? ring shares your info with police, officially only with permission, police could've and most likely got this footage instantly following or during the attack. Those cameras are clear and can give to understand why police believe after reviewing the footage that the attack was targeted.