A woman lays flowers on a memorial at the scene of a shooting in Liege, Belgium, Wednesday, May 30, 2018. A gunman killed three people, including two police officers, in the Belgian city of Liege on Tuesday. Police later killed the attacker, and other officers were wounded in the shooting. [Photo: AP/Geert Vanden Wijngaert]

Flowers are left at the scene of a shooting in Liege, Belgium, Wednesday, May 30, 2018. A gunman killed three people, including two police officers, in the Belgian city of Liege on Tuesday. Police later killed the attacker, and other officers were wounded in the shooting. [Photo: AP/Geert Vanden Wijngaert]

Police officers and others stand for a moment of silence for shooting victims near the City Hall in Liege, Belgium, Wednesday, May 30, 2018. A gunman killed three people, including two police officers, in the Belgian city of Liege on Tuesday. Police later killed the attacker, and other officers were wounded in the shooting. [Photo: AP/Geert Vanden Wijngaert]