[yukong]

I don't believe for a second that the shooter fired off more than one shot. From what I can see on tv reports, there is a wooded area just to the right of the buses. Most likely, the sounds were reverberations, echos from the shots. Not uncommon. If there was more than one shot, then there would be evidence of that in the bus.

[mhking]

Most likely, the sounds were reverberations, echos from the shots.

That would be my likely guess - there's what appeared to be a post office building nearby, plus whatever stone walls and additional architecture around; an echo wouldn't be out of line there.