At least one person was killed while three others were injured as three NATO oil tankers crashed into each other on G.T. Road here in Nowshehra on Thursday, police said. According to details, three NATO tankers carrying oil were going from Karachi to Peshawar. The incident occurred near Aza Khel area here when the tankers crashed into each other because of over speeding. As a result one person was killed while three others were inujured. After the incident, rescue teams and police rushed to the accident site and moved the injured to a nearby hospital. Police registered case and started investigation.