The WTC did have a bomb go off in their parking lot, but there was hardly any damage to deal the building any serious threat of collapse. I believe that was in 93.
Oklaholma bombing was in April of 1995. I still remember each instance of an attack, even Pearl Harbor. I'm not that old, but my grandpa tells me stories about it all the time as he worked in Alameda at the time and had to go to help rebuild.