Re: surely trying to kill someone in a business quarrel isn't terrorism?
Every time I see 'suspect had bomb-making materials' I sigh.
I have, right now, in my house, the following:
gasoline/petrol
kerosene
foam packing stuff
cooking oil (coconut derived)
cooking oil (olive derived)
cooking oil (other)
potassium permanganate
sulfuric acid
nitric acid
laundry soap (powder)
laundry soap (liquid)
fertiliser (several types)
ammonia
iodine
high-quality paper
hand soap (bar)
hand soap (liquid)
chlorine bleach
a large assortment of insecticides and herbicides
I can, with only a little effort and some glassware, make the following items using the above:
nitrocellulose
nitroglycerin
TNT
napalm
several different plastic explosives
at least three different nerve agents
mustard gas
phosgene
and more. Making a bomb would merely require packing some explosive into a container with/without extras to generate fragmentation, plus a timer (a clock or a watch; I've got those, too) or a remote detonator (a cell phone; those could be set to alarm and function as timers, too). Most of the explosive creation methods would be easily in the reach of anyone who has passed high school chemistry. Making sarin or napalm or nitroglycerin is easy, and making TNT or plastic explosives isn't that hard. Look up PETN and/or RDX. (Bad idea if you're actually intending to blow something up, unless you use someone else's account to do the looking up.) (PETN is derived from 19th century chemistry; it's trivial to make today.)