JAKARTA - Indonesia's national police spokesman Inspector General Setyo Wasisto confirmed on Tuesday (June 13) they had foiled an attempt to ship 500 detonators to West Kalimantan on the island of Borneo from South Sulawesi.

But he said they were still investigating if it was related to terrorism or mining activities.

"These detonators... trigger other explosives," Inspecter General Setyo Wasisto told reporters.

The 500 detonators were stored in a box that the sender declared to contain documents and food. Authorities found out what was inside after using an X-ray machine.

Police are investigating the case. They said they have data on the person tasked to ship the package and the person who ordered the shipment.

The packages were to be delivered on a Garuda Indonesia flight from Makassar in South Sulawesi to Pontianak in West Kalimantan.

Kalimantan is where most of Indonesia's coal mines are located. Indonesia is the world's largest exporter of thermal coal that is used in power plants. Many open pit miners in Indonesia use explosives and detonators to mine for coal.