1.   One said he saw the driver of a northbound truck throw the hitch ball out a window.

2.   Another driver, who escaped, told reporters the northbound truck zigzagged across the road before the head-on collision.

3.   The confirmed dead include the Belgian driver of a northbound truck that collided head-on with another truck, setting off the fire.

4.   The disaster happened after a northbound truck carrying insulation veered out of control and collided with a southbound truck carrying tires.

5.   The disaster happened after a northbound truck veered out of control and collided with a southbound truck carrying tires.

6.   The driver of the northbound truck which lost control and caused the disaster was unable to escape.

7.   The official Notimex news agency quoted authorities as saying that the four were arrested after officers seized the drug from two northbound trucks.