The motive for the attack has not been officially confirmed,[1] however police suspect Islamic extremism as the motive for it.[4] The Woolworth's store detective, some police officers and a number of witnesses reported hearing the attacker shout ʾAllāhu ʾakbar while committing the attack, and after the arrest he said that the attack was 'his jihad'.[3] A police spokesman said that, while the attacker had a criminal record, none of his previous offences were related to terrorism.[4] Police are also investigating if his release from psychiatric care was premature; however the suspect has not been diagnosed with a mental disorder.[7] Investigators who checked his room for more evidence, found Islamic State of Iraq and the Levant's material and papers written by the attacker in which he launched hate messages and religious extremist slogans.[11]