Belgian Interior Minister Jan Jambon says that a man who shot dead two police officers and a bystander in Liege on Tuesday had already killed another person the day before the attack.
Mr Jambon told broadcaster RTL Wednesday that the shooter, identified as 36-year-old Benjamin Herman, “also committed a murder the night before”.
Mr Jambon confirmed that the person was a former inmate who did prison time with Herman.
Herman is alleged to have killed the man on Monday evening by hitting him over the head with a blunt object.
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Herman was killed in a shootout with police on Tuesday after stabbing two female police officers, stealing their handguns and shooting them.
He also shot dead a man sitting in a nearby car.
Herman was on a two-day release from prison at the time of the shootings.