Derwish was born at Mercy Hospital in
South Buffalo, New York in 1973. He lived "on and off" in the suburb of
Lackawanna near Buffalo, among the large Yemeni community in the area. His father moved the family to Saudi Arabia to look for work after he had lost his job working at
Bethlehem Steel. His father died in a car accident three years later, leaving him to be raised by his relatives in Saudi Arabia. During his time in Saudi Arabia, Derwish became immersed fundamentalist
Wahhabist Islam. During the 1990's Derwish moved to Sanaa, Yemen, attended al-Qaeda training camps in Afghanistan and fought in the Bosnian war alongside the mujahideen before returning to Saudi Arabia in 1997, where he was jailed for extremist activities and deported back to Yemen. He often discussed the importance of jihad during his discussions to help the "oppressed people" in areas such as
Palestine or
Kashmir. He also spoke of his will to fight alongside the
Taliban and his time fighting in Bosnia, and praised militant attacks such as the
USS Cole bombing. ==Targeted killing==