Dutch police were in close contact with their German counterparts in regards to the suspect's background.[1] A police spokesman initially stated that Amsterdam police were "seriously taking into account" "a terrorist motive",[3] and this motive was later confirmed by the authorities.[2][11] Dutch authorities said that he was aggrieved against Netherlands and believed that "the Prophet Muhammad, the Quran, Islam and Allah are repeatedly insulted" in the country, specifically referring to Geert Wilders.[12]