In case you don’t know, the Grand Mufti of Jerusalem sent thousands of Muslim troops to help Hitler in Africa during WWII. Devon Arthurs, who shot his two roommates Friday in a Tampa Palms apartment, told police he shared neo-Nazi beliefs with the men until he converted to Islam, then killed them because they showed disrespect for Islam.

The Tampa Bay Times reports that 18-year-old Devon Arthurs is accused by police of killing two of his roommates, 22-year-old Jeremy Himmelman and 18-year-old Andrew Oneschuk, after they mocked Islam and Arthurs’s decision to become a Muslim.

Arthurs had become angry about the world’s anti-Muslim sentiment and “wanted to bring attention to his cause,” according to a Tampa Police Department report.

After killing his roommates the former white supremacist and newly minted Muslim took hostages at a nearby smoke shop before being apprehended by police. The Tampa Bay Times reports:

Arthurs entered the smoke shop at 15325 Amberly Drive about 5:30 p.m. and pulled a semiautomatic pistol from his waistband. “Do me a favor and get the f— on the ground!” he yelled to a female employee and male customer, the report states. Arthurs asked the customer, “Why shouldn’t I kill you?”

A few minutes later, another customer entered the store and Arthurs ordered him to get on the ground. He told all three people in the store that he had already killed someone. “He further informed all three victims that he was upset due to America bombing his Muslim countries.”

Officers found a garage stocked with bomb materials as they arrived to investigate the double homicide, leading to federal explosive charges against Brandon Russell — a Florida National Guardsman and admitted neo-Nazi.

Two Tampa police officers arrived about five minutes after the second customer entered the store. One of the hostages ran out of the store, and the officers were able to persuade Arthurs to let the other two leave. After several more minutes of negotiating, he surrendered and allowed the officers to place him in handcuffs.