Question: How many people did the mass murderer, who was responsible for sparking the creation of the NICS Improvement Amendments Act of 2007, kill?
Sentence (from "NICS Improvement Amendments Act of 2007"): The NICS Improvement Amendments Act was passed in 2007 in the wake of the Virginia Tech shootings in order to address loopholes in the National Instant Criminal Background Check System, commonly known as NICS, which enabled Seung-Hui Cho to buy firearms despite having been ruled a danger to himself by a Virginia court.
Relevant evidence: Yes