An oil spill off Balikpapan bay, East Kalimantan on 31 March 2018, that led to five deaths and the declaration of a state of emergency, was caused by a burst undersea pipe belonging to Indonesia's state oil company Pertamina.
The leakage, which started in waters near Balikpapan city early Saturday, has spread at least 26 kilometres (16 miles) and coated large areas of the coast in thick black sludge.