I wonder how old the grenade was; Was it a recent model or one left over from WWII or WWI?
If it was new, they might have a problem...
There is a great deal of incuriosity on the part of the reporter. No mention or speculation as to where the grenade might have come from or how old the grenade might be. Certainly the bomb squad could have provided info on the type of grenade and its vintage. This total lack of mention of these facts triggers a 'cover up' alarm on my part. I'm thinking retail terrorism. However, the way the story is written it's as if grenades just pop out of the ground in the Spring like tulips.