On Thursday, November 20, there was an explosion at a house on Frederik Hendriklaan in Hillegom. Shortly after the explosion on November 20, a 15-year-old man from Amsterdam was arrested. He is currently still in custody. On Friday, December 5, a 16-year-old from Amsterdam was arrested on suspicion of involvement in the same explosion. He is detained for questioning and will be presented to an examining magistrate on Monday, December 8. The investigation continues unabated, and further arrests are not excluded.