On the news tonight, they were making a big deal about a bomb found on a released felon's porch. An apartment complex was emptied when the discovery was made, and they didn't let people back in for quite some time after.
The bomb was a pipe (of some sort--details were sketchy) with some black powder and a green fuse. (Yes, they repeatedly mentioned the fuse's color.) They took the device into a field and used a sort of guillotine to cut it open, which diffused it.
The most interesting part is that the main claimed it was probably a leftover firework that his son had left on the porch. The police responded to this claim with a counterclaim that was at least as bizarre. The fact that it had a fuse and gunpowder meant, in their opinion, that it was not a firework.
I don't know what they've been lighting every Independence Day, but it sounds like it may have been a bong. Every firework I've ever lit has had a fuse (for those who are perhaps newscasters or the police in question, that's the part you light) and gunpowder (y'know, to create the effects of the fireworks).
I wasn't there, so I don't know whether this was a pipe bomb, a firecracker, or something else, but I certainly wouldn't jump to classify it based on the fact that it has a fuse and gunpowder.