Customs officers examine bags of fertilizer, some of the 30 tonnes seized from a ship from Malaysia, at a customs office in Denpasar, Bali, Indonesia, on September 22, 2016.

Indonesian authorities on the resort island of Bali on Thursday detained a ship from Malaysia carrying around 30 tonnes of fertilizer which police believe may have been intended for making bombs.

Customs and police were questioning the crew and investigating the material for potential links to radical networks as the world’s largest Muslim-majority nation remains on high alert for militant attacks.

Bali police official Hendra Suhartiyono said authorities were looking into whether the material was on its way to the eastern island of Sulawesi, a region known for militant violence.

“We are not closed to the possibility that this chemical material … could also be for the benefit of terrorist groups in Sulawesi to make low-impact and high-impact bombs,” he said.

Indonesia’s most-wanted man, a militant called Santoso, was killed by security forces in Sulawesi earlier this year.

Santoso, who had pledged allegiance to ISIS, cultivated a small radical network in the Poso area, which has now been severely weakened by a lengthy security operation.

Shipped from Malaysia

“At the moment the crew are being intensively examined on explosive material ammonium nitrate that was carried, shipped from Malaysia,” Bali customs official Thomas Aquino said.

“They confessed that the boat was rented to be shipped to Sulawesi. They thought the material in the sacks was fertilizer. We will detain the ship crew to be processed legally.”

Indonesia saw its first militant attack in several years in January in which four people were killed. The gun-and-bomb assault in the heart of the capital Jakarta was claimed by Islamic State.

Last month, authorities tightened security in Bali after reports of a suspected militant plot on the island.

A nightclub bombing on the island in 2002 carried out by home-grown militants killed 202 people, mostly Australians, and prompted a nation-wide security crackdown.

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