Emergency declared after oil spill ignites on Indonesian island of Borneo

City of Balikpapan is struggling to deal with toxic smoke from fire that killed four fisherman

The Indonesian port city of Balikpapan, on the island of Borneo, has declared a state of emergency after a devastating oil spill spread along the coast, killing four fisherman when it ignited.

The oil spill, which occurred over the weekend, has now stretched to an area of around seven square miles (18 sq km), contaminating the sea and polluting the air with thick black smoke. One protected dugong has already washed up dead on the shore.