HIDALGO, Mexico — Authorities have recovered a transport truck that was hijacked in Mexico while hauling a load of sodium cyanide.

The deadly cargo, however, was mostly gone when the truck was recovered in Apizaco Tejocapalan, Mexico. Only 29 of the 96 drums of sodium cyanide were left on the truck when it was located.

The chemicals were being hauled in drumps that were on pallets and shrink-wrapped. No evidence of pallets or plastic were found when the truck was discovered. It appears the hijackers accidentally spilled some of the substance, which can be fatal when ingested, touched or inhaled.

The hijacking was done at gunpoint, and new fears of a possible terrorist attack by truck are now surfacing. Hazmat haulers are being warned to be extra vigilant following this hijacking. The hijacking took place north of Mexico City by three gunmen on May 12.