Floods sparked by torrential rains have killed nearly 40 in Indonesia with a dozen more still missing, officials said on Monday, marking the latest calamity for a disaster-prone nation. Landslides and floods are common, especially during the monsoon season between October and April, when rains lash the vast Southeast Asian archipelago. On Monday, Indonesia’s disaster agency confirmed 29 deaths and said at least 13 more people were missing in Sumatra island’s Bengkulu province. A landslide triggered by heavy rain in neighbouring Lampung province on Saturday also killed a family of six. Meanwhile, flooding in and around parts of the capital Jakarta last week killed at least two people, forced more than 2,000 to evacuate their homes and set 14 pet pythons on the loose. In Bogor, a satellite city of Jakarta, residents had to contend with the prospect of coming face to face with the giant serpents, after they were set loose from a private property due to the high waters. Six of the snakes – which were as long as four metres (13 feet) – have been found, but the remaining eight remain on the loose, officials said at the weekend. In Sumatra, authorities said that illegal coal mining was partly to blame for deadly landslides as the practice makes loose soil susceptible to slides when heavy rains hit. “Apart from natural factors like the heavy rain, [the flooding] was also caused by human activity that destroys the environment,” disaster agency head Doni Monardo told reporters in Bengkulu on Monday. Activists have long warned deforestation from rampant mining in the province could trigger a catastrophe. At least four major rivers in Bengkulu overflow every time it rains due to environmental damage near their banks, activists said. “The flooding in Bengkulu was made worse by the severe damage … caused by coal mining,” Ali Akbar from local environmental group Kanopi Bengkulu said in a statement. Illegal mining was blamed for killing dozens on the island of Sulawesi in March when a makeshift mine collapsed. Last month, some 112 people died and more than 90 remain missing after torrential rains pounded Indonesia’s Papua region, triggering landslides and flash floods.