Belgian authorities said on Friday that the lone assailant who killed one police officer and wounded another in a stabbing attack had been on a counterterrorism list of potential extremists. The Belgian suspect had gone to a police station early on Thursday to express hatred for them, but couldn’t be arrested. That evening he launched his stabbing attack on two police officers. “The man was on the OCAD list,” Federal Prosecution Magistrate Eric Van Der Sypt said, referring to the organisation that assesses the terrorism threats in Belgium. The suspect was identified as Yassine M, born in Bruss…