The National Explosives Task Force has issued a Public Safety Advisory on May 29, 2015, with regard to the proper use of exploding targets.
Here’s a snippet:
While most people who use ETs do so in a recommended and responsible manner, a number of individuals have been seriously injured or killed by their misuse. These explosives produce a blast and, if misused, can potentially generate high-velocity fragments that can cause damage to nearby objects and could injure or kill people. This advisory is designed to increase the public’s awareness of these products, and to inform people using, encountering, or in the proximity to ETs.
Read the full advisory in this Adobe Acrobat document.