Toll roads in Gauteng are monitored at the SANRAL control center in Midrand. Picture: Oupa Mokoena

Pretoria - The Gauteng highway tolling system was disrupted on Tuesday when Sanral's operations centre in Pretoria had to be evacuated, the company said.

SA National Roads Agency Limited (Sanral) spokesman Vusi Mona could not say how the system was disrupted.

“Our priority is to ensure the safety of the people who work at the central operations centre,” he said in a statement.

The Tshwane hazardous material unit was called to the centre on Monday afternoon after a “suspicious envelope containing a white substance” was found on the premises.

This resulted in the shutdown of electricity and the evacuation of the building.

“We take this matter very seriously and condemn this type of action in the strongest possible terms.

“It is tantamount to sabotage and borders on a very serious crime,” said Mona.