**Shamsud-Din Jabbar** drove a truck into a crowd, killing 14, and had previously posted recordings condemning music, labeling it the "voice of Satan."
In **audio recordings** on SoundCloud, Jabbar warned music could lead to "forbidden" behaviors, although he did not express intentions of violence.
His brother noted Jabbar became more religious and modest in the year leading to the attack, but saw no signs of **radicalization**.
Authorities are examining Jabbar's transition, including videos posted shortly before the attack claiming allegiance to **ISIS**.
Islamic leaders have condemned Jabbar's actions, asserting that extremist ideologies fundamentally oppose the teachings of **Islam**.
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