Abdullah AHH, 20, was arrested on Wednesday for an attack that left Thomas L, 55, and another man, 53, seriously injured in Dresden on October 4.
The terrorist was only released from prison five days earlier after he was jailed for two years and nine months in 2018 at the age of 18.
He arrived in Germany from Aleppo in 2015 as an unaccompanied minor and was granted refugee status in May 2016.
AHH lost this status due to his criminal record in 2019, but cannot be deported due to civil war in his home country.
Syrian ISIS supporter Abdullah AHH (pictured), 20, was arrested after a tourist was stabbed to death and another was seriously injured in the eastern German city of Dresden on October 4.
While living in asylum, terrorists began recruiting for ISIS and threatening Christians, reports PICTURE.
Writing to a Christian, he said: ‘I will slaughter you today. You have a big mouth and I’m going to cut your tongue, you Christian. ‘
He was arrested in 2017 and categorized as a potential threat to public safety, said Saxony state police chief Petric Kleine.
About 600 suspected Islamists fall into this category in Germany, according to authorities.
In the 2018 trial, AHH was proven to have used the ISIS symbol on his Facebook profile and also spread jihad via social networks and called on like-minded people to fight as martyrs against so-called infidels.
A statement on the court ruling reads: ‘The accused has been advocating for jihadist ideology since the start of the summer of 2017, increasingly turning to ISIS and ultimately, as its supporters, fearful of an attempted assassination.
AHH also searched the Internet for instructions on how to build explosives belts, the court heard at the time.
He is reportedly planning to bomb folk festivals including Dresden’s bird meadow or film nights on the shores of the Elbe in 2017.
The Syrian was released from prison, where he had served more than two years for recruiting members to a terrorist organization, just days before the attack.
The victim of the attack in the central city of Dresden was a German man from the western state of Rhine-Westphalia who was on vacation, according to police.
A kitchen knife that investigators believe was linked to the attack was found at the scene with DNA traces on it.
The victims, one aged 53 and the other 55, were German men from the western state of Rhine-Westphalia who were on holiday in Dresden (pictured). The 55-year-old man died later in hospital
In an assessment months before the attack, authorities said it was very likely the man would commit more crimes once released, Kleine said.
He was under surveillance on the day of the attack and two days earlier, Dirk-Martin Christian, head of the Saxony branch of the domestic intelligence agency, said.
Mr Christian added that people who have recently been released from prison are usually not monitored 24 hours a day.
He said: “ We are talking about an intelligence service that is not aiming to prevent harm, but to observe whether the person is moving in a radical environment.
‘The following could happen. The bystanders sat in the car and watched the person. And suddenly he took out his gun.
‘You are in the car and, bitter though it is, should pay attention to it. Observation is not an appropriate tool to prevent such actions. It doesn’t matter if we watch him for 24 or six hours. ‘
Abdullah AHH was charged with murder, attempted murder and dangerous physical damage to the Dresden attacks.