Waco and Oklahoma City both occurred on April 19, NOT be coincidence. From Wikipedia: “Motivated by his dislike for the U.S. federal government and unhappy about its handling of the Ruby Ridge incident in 1992 and the Waco siege in 1993, McVeigh timed his attack to coincide with the second anniversary of the fire that ended the siege at the Branch Davidian compound in Waco, Texas.”
I will mention (for the fun of it ;>) something else that might, or might not be, a coincidence - the three tragic events occurred in the following order:
Naples - Waco - Oklahoma City
N - W - O
I've never seen anyone else comment on that place name sequence, likely because the first event is commonly called Ruby Ridge, rather than Naples (in reference to the nearest city, as with the other two events). It would be a truly bizarre coincidence, given the political debate at that time, and in the years since, concerning the "New World Order"...
;>)