He was convicted of supplying guns to the two men who opened fire outside the Prophet Mohammed cartoon drawing contest.
The gunmen, Elton Simpson and Nadir Soofi, were killed by police, prompting some Islamophobes to react with glee.
Kareem will be sentenced on June 27 and could face up to 45 years.
He denies knowledge of what his friends were planning.
Prosecutors argue Kareem hosted Simpson and Soofi at his home, where they planned the attack, and went for shooting practice in the Arizona desert.
Kareem says he kicked Simpson out of his home as he suspected he had placed a tracking device on his car, and that he did not approve of Simpson using his laptop to watch Al-Qaeda videos.
Prosecutors allege Kareem attempted an insurance scam to fund IS and sought to encourage two teenage boys to join radical jihadism.
http://www.infowars.com/draw-mohammed-contest-attack-accomplice-found-guilty-of-terrorism/
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