The Washington Post reports a good background story of one of the arrested terrorist Jason Walters who threw hand grades to the police. He is a sun of an Afro American father, Carl Walters, and Dutch mother Ingrid. It is un reported if the father is Muslim. What is known is that after Jason officially converted to Islam that he has traveled to Pakistan or Afghanistan. After that his mother fled her own house in Amserfoort because her sons where threatening her. She reported this to the police. The mosque in Amersfoort also reported to the police that her two sons where calling for the Jihad.
Read the full story: Washington Post (English)