For that you have to go a little further back in time. Very briefly and concisely explained: Moluccans fought for the Dutch colonizer in the Royal Dutch East Indies Army – the KNIL. After the independence of Indonesia in 1949, the KNIL was disbanded.
The Moluccans did not want to belong to Indonesia and declared the Republic of the South Moluccas, the RMS, in April 1950. In 1951, the Netherlands brought the Moluccan KNIL soldiers and their families to the Netherlands on military orders. On the way here they are discharged from the army. The thousands of Moluccans are accommodated in all kinds of residential areas, such as Schattenberg. Better known as the former Camp Westerbork.
The Dutch government promises the Moluccans that they can return safely, but does not keep that promise. A temporary stay becomes permanent.
A large group of second generation Moluccans see the pain and humiliation of their parents, who are not heard by the government. The anger among these young people was sparked in 1966 after the execution of Chris Soumokil, the president of the South Moluccas, on the orders of Indonesian President Suharto. When the same Suharto came to the Netherlands on a state visit in 1970, it was time for action.
In August of that year, the home of the Indonesian ambassador in Wassenaar was occupied by dozens of Moluccan young people. An officer is shot dead, others are taken hostage. After twelve hours they surrender. In 1975, other Moluccans tried to take Queen Juliana hostage, but failed.