"The containers came from Angola in southern Africa through a Singapore-based company Sunagro International and were found during a check at the station from July 1 to July 15," Investigating Officer, Rajendra Diwakar said.
The explosives were found in four out of the thirteen containers, they said.
The consignment was to be delivered to a company, Yantra Steels in Nagaur district, he said, adding, 27 "live war" materials have been found in the containers.
"Army has been informed about it and a detailed investigation by them would reveal the use of the material," he said.