[1] In March 2004, Mohammed was arrested in Copenhagen, Denmark, at the request of Moroccan authorities for his alleged role in the 2003 Casablanca bombings.

[8] While in Sweden, he was the "uncontested leader of an extremist group centered around the Brandbergen Mosque" in the Stockholm suburb of Haninge, according to the U.S. Treasury Department.

[3][9] Säpo, the Swedish Security Service, had been keeping an eye on him since the mid-1990s, suspecting him of leading an Islamist network that supported terrorism abroad.

[6] Mohammed reportedly served, at some time in the past, as "Abu Musab al-Zarqawi's representative in Europe for issues related to chemical and biological weapons".

[6] The U.S. military said that it tracked Abu Qaswarah to a building in Mosul, which served as a "key command and control location" for Al-Qaeda in Iraq.