Far as I recall no muslim involvement was ever deemed a factor there.
However, that pales in comparison to the hundreds of atrocities commited by koranimals in the US, and tens of thousands worldwide.
The 80% of the koranimals that continue to perpetrate atrocities, or their supporters, give the 5% of truly civilized muslims a bad name.
According to one researcher, I can't remember her name, I think she has written a book about it, said that there was a muslim group connected to the OK City bombing. There was an eyewitness who handled the paperwork when McVey rented the truck who said that a mid-east looking guy was with McVey.
This same researcher connected one of the 9-11 muzzies to the OK City bombing.