This is something European authorities never wish to admit, as it interferes with their narrative that the migrants are harmless, grateful, and beneficial to their host societies.

“Police admit ‘confused man’ who massacred 18-year-old boy in Oss is asylum seeker from Sudan,” translated from “Bij politie bekende ‘verwarde man’ die in Oss 18-jarige jongen afslachtte is asielzoeker uit Soedan,” by Bas Paternotte, ThePostOnline, April 21, 2020 (thanks to RB):