stanleyc- it’s not only referring to a cop getting shot.It’s telling you to report anything suspicious looking like an abandoned bag or something like that.
Actually, I was once in Penn station and there was a backpack sitting there for like 15 minutes with no apparent owner. I went over to the nearest cop and told him about it. (It was right after the whole Times Square bombing scare so I was paranoid…) It ended up being nothing but you never know. And better safe than sorry, right?