Belgian authorities investigate the murders of two police officers and another man in the city of Liege on May 29, 2018.
The modus operandi of the crime lends credence to the hypothesis that it was a terrorist attack, considering that ISIS online videos often call on their followers to attack police and kill them with their service weapons, Van Der Sypt said.
Two of his victims were 45-year-old Lucile Garcia and 53-year-old Soraya Belkacemi, police officers, both of whom stole their service revolvers and shot them on the spot when they stopped him for scrutiny.
On Wednesday, it was revealed that Herman killed another person the day before his attack in Liege.
Belgum's interior minister Jan Jambon has revealed Herman "committed a murder the night before", killing a former inmate who he did prison time with. He allegedly killed him on Monday evening by hitting him over the head with a blunt object. Listen, you do what I say, but don't worry.
Police Chief Christian Beaupere said "the goal of the attacker was to target the police". Belgian authorities have not said if they have evidence the inmate had vowed allegiance to IS or was acting on its orders.
The source said Herman had past convictions for robbery, violence, and drug dealing.
"He committed the attack in response to [our] calls to target the countries of the coalition", the terrorist group said in the statement, referring to the global armed forces who have been fighting the group in Syria.
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The gunman's motive is not yet clear, but local prosecutors have stated that terrorism is the "likely" motivation for the attack.
Herman was out on day release in the city of Liege when he crept up behind two female officers and stabbed them repeatedly. "He was shot dead", Dulieu said.
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. The attacker was later killed by police.
Authorities said Herman, who was on a leave of absence from jail when the attacks occurred, had several encounters with police since he was a minor.
Today Mr Jambon, Prime Minister Charles Michel and King Philippe all visited the woman taken hostage.
A Belgian federal magistrate said on Wednesday, however, that the attacks were being considered "terrorist murder" and the investigation was focused on whether the attacker acted alone. Police and security officials also assembled in Brussels and Antwerp to mourn the loss of their two colleagues.
Nevertheless, Belgium's crisis center said the country's terror threat alert would not be raised and remained at level 2 out of 4.