I went to my local supermarket this afternoon, and as I removed a cart from the storage area, I noticed that the adjacent area had a cardboard box sitting on top of the row of empty shopping carts. The box looked to be taped up. It could it could have been left by mistake by a shopper, it could have been a bomb. As I went into the shop, I stopped at the security desk and told the guy sitting there about it, he said he would take a look. I did my shopping, and left the shop somewhere between 10 and 15 minutes later. The box was still there, apparently untouched. I didn't see any Iranian script on it, thankfully.
It's good to know we are prepared.