The Columbine High School massacre in Colorado on April 20, 1999 was another seminal event in SWAT tactics and police response. As perpetrators Eric Harris and Dylan Klebold were shooting students and staff inside the school, officers did not intervene in the shooting, but instead set a perimeter as they were trained to do. By the time they did enter the school, 12 people were killed and Harris and Klebold had committed suicide. They were also heavily criticized for not saving teacher Dave Sanders, who had died from blood loss, three hours after the SWAT first entered the school. As noted in an article in the "Christian Science Monitor", "Instead of being taught to wait for the SWAT team to arrive, street officers are receiving the training and weaponry to take immediate action during incidents that clearly involve suspects' use of deadly force." The article further reported that street officers were increasingly being armed with rifles, and issued heavy body armor and ballistic helmets, items traditionally associated with SWAT units. The idea was to train and equip street officers to make a rapid response to so-called active shooter situations. In these situations, it was no longer acceptable to simply set up a perimeter and wait for SWAT. As an example, in the policy and procedure manual of the Minneapolis Police Department, it is stated, "MPD personnel shall remain cognizant of the fact that in many active shooter incidents, innocent lives are lost within the first few minutes of the incident. In some situations, this dictates the need to rapidly assess the situation and act quickly in order to save lives."