The United States moved to deny any US financing or material support to alleged extremists operating in Afghanistan, Europe and Lebanon.
The State Department targeted brothers Yassin and Mounir Chouka, who it said are recruiters, facilitators and propagandists for the Islamic Movement of Uzbekistan (IMU) and stage operations along the Afghanistan-Pakistan border.
It also targeted Mevlut Kar as a facilitator and recruiter for the Islamic Jihad Union (IJU). It said he is implicated in a 2007 bomb plot targeting US military facilities and US citizens in Germany.
The Chouka brothers, which Washington lists as dual Moroccan and German nationals, and Kar, listed as a dual Turkish and German citizen, are also alleged to have links with Al-Qaeda.
Kar, wanted by the Lebanese government, was sentenced in his absence to 15 years in prison for attempting to establish an Al-Qaeda cell in Lebanon, the State Department said. Interpol has also issued a warrant for his arrest.
The State Department formally designated the three as global terrorists, prohibiting Americans from engaging in financial transactions with them and freezing any assets they may have under US jurisdiction.