It looks like that was a pretty powerful bomb to cause so much damage to so many buildings but, on the other hand (for me, at least), it further goes to prove that it was more than JUST a car bomb that went off at the OKC federal building in 1995.
I'm thankful no one was seriously injured, though the article did say that human remains were found at the scene but they weren't sure whether it was the suspect or a victim. This is the type of thing you expect in the Middle East, not Hometown, America. However, it's also obvious that this bomb was not intended to kill anyone (except, possibly, law enforcement officers responding to the bomb threat) as evidenced by the ample warning that was given ahead of time.