This seems like a variant of a story I read a few years ago, in which a teen girl called 911 to report she blew off her hand from a firecracker she thought was a candle. There was even a tape of the 911 call where the operator misunderstood the seriousness of the matter until the teen, a little frustrated to be spoken to condescendingly, says "it blew my hand off!"
I am never sure what news reports mean when they describe things like "candle." A Roman Candle, I think, can take a few fingers off, but I also agree that a real stick of dynamite shouldn't explode without a detonator. If it was really old, made of nitroglycerin and sawdust, it might seem like a crude candle, but could that be detonated by a fuse? I dunno.
DCH