QUETTA, Feb 12 Three security personnel were killed on Friday when a tanker carrying oil for Nato forces in Afghanistan overturned and crashed into their vehicle in the border town of Chaman, some 130km from here.

A senior police official told Dawn that the tanker driver had been taken into custody and a case had been registered against him.

According to sources, the oil tanker going to Kandahar fell on the security personnel's vehicle at a bridge near Wapda grid station. Senior officers reached the site of the accident and shifted bodies to civil hospital, Chaman.

A few days ago, five people, two children and a woman among them, were killed in the area when a container carrying Nato supplies fell on their car.

SUFFOCATION Two policemen - ASI Allah Dina and Constable Mohammad Irshad - died of suffocation in the Police Training College in Quetta, police sources said.

The sources said on Friday that the door to the room in which the policemen were sleeping was broken after calls by colleagues remained unanswered.

They said the room was air-tight and the gas heater was still on when the door was broken, adding that the two might have died of suffocation.