Shooting spree at the high school injures several students . Mother of middle school student says ` ` It was total . '' Murrysville , with a population of about 20,000 , is a quiet residential neighborhood .
Stabbing spree at Pennsylvania high school injures 20 students . Mother of middle school student says `` It was total chaos '' Murrysville , with a population of about 20,000 , is a quiet residential enclave .