It was one of Trump's own loyal soldiers as he confessed his motivation was Trump's claims the 2020 election was stolen. And it gets better Trump's pardon of January 6th insurrectionists may apply to him so he walks free. How about that MAGA has their very own pipe bomber.
https://www.thedailybeast.com/pipe-bomb-suspect-brian-cole-said-he-believed-the-2020-election-was-stolen/