During the 1930s the Dutch colonial powers initiated a "transmigration plan" to move people from heavily populated islands such as Java, to the less populated islands of Irian Jaya and Kalimantan. In the 1960s the Indonesian government granted the Madurese rights to clear forests for palm oil cultivation. This conflicted with the local Dayak tribes' traditional way of life. The tensions between the two ethnic groups resulted in major eruptions of violence in 1996, the Sambas riots in 1999 and the Sampit conflict in 2001, resulting in thousands of deaths.