BERLIN (AP) — German authorities have arrested four Iraqis suspected of membership in the Islamic State group, including one who is alleged to have carried out attacks that killed and wounded U.S. troops, officials said Thursday. The men were arrested Wednesday in the western cities of Dortmund and Bottrop, and Amberg-Sulzbach county in Bavaria, the federal prosecutors' office said in a statement. Among those arrested was Mohammed Rafea Yaseen Y., who is suspected of joining the Islamic State of Iraq group in his western hometown of Rutba in 2006.