BRUSSELS (AP) — 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.

Jambon told broadcaster RTL Wednesday that the shooter, identified as Benjamin Herman, “also committed a murder the night before.”

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.

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.

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LIEGE, Belgium (AP) — A knife-wielding prison inmate on a 48-hour leave stabbed two police officers Tuesday in the Belgian city of Liege, seized their service weapons and shot them and a bystander to death before being mowed down by a group of officers, setting off a major terror investigation into the country’s most savage assault since 2016 suicide attacks.

Prime Minister Charles Michel acknowledged the assailant, who had a lengthy criminal record that included theft, assault and drug offenses, had appeared in three reports on radicalism but was still allowed to take a leave from prison.

“Is our system working when we see that these kind of people are running free?” asked vice premier Alexander De Croo, echoing the thoughts of many in a nation where armed police and gun-toting soldiers still patrol the streets in the wake of the March 2016 attacks that left 32 people dead at the Brussels airport and subway system.

Tuesday’s attack happened outside a cafe in the eastern city of Liege when the assailant crept up on the two female officers from behind and stabbed them repeatedly.

“He then took their weapons. He used the weapons on the officers, who died,” the Liege prosecutor’s spokesman, Philippe Dulieu, told reporters.

Dulieu said the attacker then shot and killed a 22-year-old teacher in a vehicle that was leaving a parking lot outside a nearby high school. He then took two women hostage inside the school before confronting police massed outside.

“He came out firing at police, wounding a number of them, notably in the legs. He was shot dead,” the spokesman said, adding that the hostages escaped unharmed.

Justice Minister Koen Geens described the assailant as a repeat offender who had been incarcerated since 2003 and was due for release in two years.

Police Chief Christian Beaupere said “the goal of the attacker was to target the police.” He identified the slain officers as 45-year-old Lucile Garcia and 53-year-old Soraya Belkacemi. He said Belkacemi was the mother of 13-year-old twin daughters who earlier lost their father, also a police officer. Four other officers were wounded in the attack, one seriously with a severed femoral artery.

Belgian media identified the suspect as Benjamin Herman, a Belgian national born in 1982, though in keeping with standard procedure authorities declined to confirm his identity.

Interior Minister Jan Jambon said authorities were also investigating the suspected killing on Monday of an old acquaintance of the assailant and said there could be a link. “It is a serious hypothesis,” he told the VRT network.

Asked about a video from close to the scene in which someone appeared to be shouting “Allahu Akbar!” in the din, Jambon said: “My reaction is that in many terror acts, it is the last thing they shout.” But, he added, it is up to federal investigators to determine if Tuesday’s attack was terrorism.

“The investigation judge must find out if we talk about terror. Because terror also has to do with someone who gives the order, ISIS or someone else, if others are involved. We need to look at all these elements,” Jambon said.

Michel said the suspect in Tuesday’s attack was indirectly mentioned in state security reports on radicalization. But, the prime minister added, the reference was “in notes that did not primarily target him, but others or other situations,” and he was not on a list of suspects maintained by the main OCAD anti-terror assessment group.

Asked about reports that the assailant was radicalized in prison, Geens, the justice minister, said it “was not a clear-cut case.”

“He certainly was not someone who could clearly be qualified as radicalized. Otherwise he would have been known as such by all services,” Geens said.

But a senior official at the federal prosecutor’s office told The Associated Press that “there are indications it could be a terror attack.” He spoke on condition of anonymity because he was not authorized to discuss the ongoing investigation.

Nevertheless, Belgium’s crisis center said the country’s terror threat alert would not be raised and remained at level 2 out of 4. It briefly stood at a maximum 4 shortly after the 2016 attacks.

Belgium’s King Philippe, Michel and the country’s justice and interior ministers traveled to Liege to confer with local officials.

“I want to offer my government’s support for the victims, for the victims’ families,” Michel said.

It’s not the first time Liege has been hit by a violent attack. In December 2011, a man with a history of weapons and drug offenses hurled hand grenades into a square filled with Christmas shoppers then opened fire on those who tried to escape. Five people were killed, including the assailant.

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Cook and Casert reported from Brussels.