Odd question, need advice

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Recently someone I know mixed a strange concoction in a large mason jar, set it in the oven (for an unknown amount of time), resulting in a significant explosion that blew out the glass in the oven and shook the house. This person claimed they were making said concoction in order to ward off bugs (flies, mosquitos etc) in the house. I am nearly certain the reason given is false, and have fears that this person was trying to cause a larger explosion with ghastly potential consequences.

I am posting here to get the opinion of those more knowledgeable than I, and will certainly follow up with authorities should this point to the nefarious intentions that I suspect.

Also, I should mention the person who made the concoction has a background in chemistry, so they certainly had some understanding of what they were doing.

We were able to deduce what the person had mixed in the jar by observing the nearby containers of various substances. A list of these substances follow;
Lye
Sodium Hydroxide
Sulphuric Acid
Old English Oil - main ingredient C13-C14 Alkane
"Vision Pow" toilet bowel cleaner
Amaz water stain remover
Baking Soda
Vinegar
Liquid Drain Opener
Green container with label removed - substance inside was a green/blue/grey paste - possibly some type of miracle gro? - uncertain.

Any help would be appreciated. I have a strong feeling this person had criminally nefarious intentions and am ready to proceed with the authorities.

Is there any reasonable chance that someone with a chemistry background was NOT trying to concoct a bomb by mixing then heating these substances?

Also, if anyone can recommend a better place to post this please advise

Thanks for anyone's help. Will post followup if there's interest.