A Berlin court has convicted a Syrian teenager of contributing to an Islamic State-inspired plot to attack a Taylor Swift concert in Vienna.

Three dates in the US pop star’s record-breaking Eras tour were cancelled last summer after authorities learned of the plot.

The 16-year-old defendant, named by prosecutors as Mohammad A, was found guilty of “preparing a serious act of violence endangering the state” and “supporting a terrorist act abroad”. He was given an 18-month suspended sentence.

Mohammad A, who was 14 at the time of the foiled attack, had been “radicalised by IS [Islamic State] propaganda on the internet”, the court said. He was found guilty of providing support to another teenager in Austria in plotting the atrocity.

“The defendant sent him a video with instructions on how to build a bomb and put him in contact with an IS member,” the court said.

Mohammad A made a full confession during the trial.

The Vienna leg of Swift’s tour was called off last August after two people were arrested over an apparent plot to launch an attack on a public event in the Austrian capital. Authorities said they had arrested a 19-year-old man for allegedly planning an attack in the Vienna region and suggested that Swift’s shows had been the “focus” of the plot.

The 19-year-old suspect intended “to kill himself and a large crowd of people”, said Omar Haijawi-Pirchner, the head of state protection and intelligence at the Austrian interior ministry, at the time.

Austrian authorities have detained three suspects over the plot, which was thwarted with the help of US intelligence – all of them teenagers at the time.

The main suspect is an Austrian with North Macedonian roots who has confessed that he “intended to carry out an attack using explosives and knives”, according to Austrian intelligence.

Police first took Mohammad A into custody last September in the eastern city of Frankfurt an der Oder, where the then 15-year-old went to school.

Swift later wrote on social media that “the reason for the cancellations filled me with a new sense of fear, and a tremendous amount of guilt because so many had planned on coming to those shows”.

German authorities have reported increasing radicalisation of younger suspects among the far-right and radical left as well as among Islamic extremists.