One male student is in custody following a mass stabbing at Franklin Regional High School in Murrysville, Pennsylvania Tuesday morning. Initial reports from local news station WPXI stated that five or six people were injured in the attack, but that number has grown to 20. Four of the victims required surgery, but no fatalities have been reported. According to WPXI's Joe Holden, the first call to police was at 7:13 this morning, and the attack occurred over the course of about 40 minutes this morning, in multiple classrooms and hallways.
This attack takes place one year, to the day, since a mass stabbing at Houston's Lone Star College that claimed 14 victims, but no fatalities.
In January of 2013, Lone Star College’s North Harris campus was the site of a shootout that resulted in 3 injuries, and no fatalities.
On December 14, 2012, the same day as the horrific shooting in Newtown, Connecticut that killed 26 people, a mass-stabbing in China wounded 23 children and one adult, but resulted in no fatalities.
You can watch WPXI's live coverage of the incident here.
Update: According to WPXI, there are seven victims with potentially life-threatening injuries. At a press conference this morning, the Chief of Police revealed that the suspect used two knives, and was subdued via intervention by the school's principal, and a school resource officer.