Forget Fatah (with or without the Islam) there's new millies on the block

As there is another radical group of Islamists whose ascension is on the rise and their base of operations is located in the heart of the West and fights in the East reports the Jerusalem Post:

While Israelis are preoccupied with threats from Hamas, Iran, Hizbullah, Syria and even al-Qaida, they pay almost no attention to a large, widespread Islamist movement whose goal is to establish a caliphate on the lands "occupied by Zionists."
Hizb ut-Tahrir, or the Party of Liberation, is totally unknown to most Israelis.

This Sunni pan-Islamic Party, which has more than a million members in at least 40 countries, is becoming increasingly popular in the Arab world. The party, founded in Jerusalem 54 years ago, is now returning to its birthplace, presenting a revived caliphate as a viable solution to the problems of the Muslim world.

Hizb ut-Tahrir members are reserved about activities within their country of residence, occasionally condemning their own foreign offshoots. Thus, Britain has turned into a perfect base for Hizb ut-Tahrir operations abroad, whose goal is radicalization of Muslims all over the world, especially in the Palestinian Authority and in Central Asia.

Although Hizb ut-Tahrir does not admit to employing violent means of "persuasion" such as those used by Hamas and Osama Bin Laden, it does use terrorism as a tool, assisting other "holy warriors." The British suicide bombers who killed three people and wounded more than 15 at Mike's Place in Tel Aviv in April 2003 were recruited by Hizb ut-Tahrir for Hamas, according to The New York Sun.

Despite being banned in Russia, Hizb ut-Tahrir is rapidly growing in the country's eastern areas. More than least 50 cells that were distributing radical literature, converting locals and preaching for jihad, were arrested by the Russian secret services in the past two years, the head of the Russia's Internal Affairs Department said last week. Hizb ut-Tahrir also planned to assassinate St. Petersburg's governor early last month.
(…)
Hizb ut-Tahrir has recently started boosting its activities in Middle Eastern countries such as Lebanon, Jordan and the PA. The organization's global leader, Sheikh Abu Yasin Ata ibn Khalil Abu Rashta, a Jordanian Palestinian, secretly resides in Lebanon, according to the Jamestown Foundation in Washington.

The party is becoming increasingly visible within the PA, mostly in Judea and Samaria. According to Israeli security services, there are close to 1,000 Hizb ut-Tahrir activists living in east Jerusalem. A few years ago, the security services raided Hizb ut-Tahrir's office in Ramallah and seized vast stores of radical literature in Arabic, Uzbek and other languages.

Hizb ut-Tahrir's activists organize demonstrations and meetings, competing with Hamas. The party called to boycott PA elections in which Hamas took part, distributing more than 10,000 leaflets at Al-Aksa alone. Today, as Hamas fights Fatah, Hizb ut-Tahrir's standing in the West Bank is on the rise.

Unlike many Islamist movements, whose funding from abroad can be cut off at any time, Hizb ut-Tahrir's support comes from Western countries, where their activities are monitored, but not banned. The Party of Liberation is waiting for the right opportunity to come out from the shadows and replace the current dominant Palestinian factions.

I found this British Independent article circa 2005 which goes into more background on the group and its activities in Britain.