Did You Hear That?

Last night we all heard a loud bang around 9 o'clock. We commented to each other about it, "Did you just hear that?" We all heard it, but couldn't identify it. Didn't sound like a gunshot or an accident, so we didn't worry.
This morning when I came out to water (before 10 a.m. -- water rationing), I noticed a car across the street with it's blinkers flashing. Two women were talking on the corner.
One called out to me to ask if I had heard a loud bang last night. Turns out she had found the remnants of a bottle bomb on the corner, by the elementary school.

This is the main part. Back by the tree you can see the bottom of the bottle that had been blown off. It had some odd colored liquid in it. All around, including on the other side of the elementary school fence were these balls of burned foil.

The police officer who came to check it out was not too concerned because they had had other small explosions on the other side of the school in the last few weeks, but when he actually went over to the remains and saw what was there you could see that this was a bit worrisome because it is apparently a step up from what the neighborhood bomber had been doing.
When he found out we had heard it -- the woman who found it had not -- he asked if we came out to investigate. No. And now that I know what it was, I don't feel so bad about that. But now that we know what a small bomb sounds like we will call the police next time. Sigh.
The hope is that the person will be caught before they hurt themselves or someone else.