As in the case of Syria, both groups denied any involvement.

PFLP-GC said in a statement 'it was surprised' to see its name mentioned in Mehlis's U.N. report. It added 'There is no evidence whatsoever on the PFLP-GC`s involvement and no contacts were made by the international investigation commission with any member of our group,' the statement said. 'All that was said in the report about the PFLP-GC is totally untrue,' the statement added.

The Islamic group Al-Ahbash also denied accusations of involvement in the crime stressing in a statement that 'the group has no link whatsoever with this act and is keen more than ever to uncover the real truth.'

The investigation headed by Detlev Mehlis, a German prosecutor, found that Lebanese and Syrian agents planned the assassination.

It said a member of al-Ahbash identified as Ahmed Abdel Aal made several phone calls the day of the assassination and two days after with Lebanese security officials. It also said Abdel Aal telephoned President Emile Lahoud minutes before the blast that killed Hariri. President Lahoud also denied receiving the call. The ministry of communications should be able to provide Mehlis' team all the records on the Cellular calls made , if they havnt already done so. Minister Marwan Hamade, who survived an assassination attempt is now in charge of the ministry of Communications.

But who is Ahmad Jibril.
Ya Libnan did some research and found out the following:

Ahmed Jibril (born 1928) is the founder and leader of the Popular Front for the Liberation of Palestine - General Command (PFLP-GC), part of the left-wing, secular Palestinian rejectionist front, so-called because they reject proposals for a peaceful settlement with Israel.

Since its inception in 1968, the PFLP-GC has staged numerous attacks against Israeli and other targets, both military and civilian.

Jibril's son, Jihad Ahmed Jibril, who headed the PFLP-GC's military wing and was in line to replace Jibril as leader of the group, was killed by a car bomb in Beirut on May 20, 2002.

Jibril was born in Jaffa, now in Israel, in 1928, but his family moved to Syria, where he was raised, and where he served as an army captain. He founded the Palestinian Liberation Front in 1959, then joined George Habash to found the Popular Front for the Liberation of Palestine in 1967, a communist armed movement opposed to the nationalism of Yasser Arafat's Fatah movement.

Jibril broke away from the PFLP because of disputes between Habash and the Syrian government. Jibril has not wavered in his support of Syria, and his group remains based in Damascus.

Although for decades the PFLP-GC's ideology was almost identical to its parent groups the PFLP and PLO, Jibril never wavered from his belief that Palestine could only be liberated through military attrition. He joined Habash and other splinter groups in the so-called "rejectionist front," which opposed negotiations of any kind with the Israeli government. He launched a variety of inventive attacks, including the legendary "Night of the Hang-gliders" (1988) that earned him the eternal enmity of Israelis by embarrassing their border security.

Jibril was also the first old-guard Palestinian militant to embrace the aid of the Islamic Republic of Iran, Hezbollah, and Islamic Jihad. Unlike George Habash, a Greek Orthodox Christian, Jibril was able, as a Muslim, to correlate Islamic radicalism and his Marxist ideology. By the early 1990s, with the rise of Hamas in the Gaza Strip and the West Bank, Jibril had ceased to be a key threat to the Israelis.

The PFLP-GC maintained cells in several European cities, which carried out anti-American or anti-Israeli operations on behalf of Syria, Libya, and Iran.

And what about Al Ahbash ? Here again we did some research and found out the following:

Al-Ahbash is a religious sect and political party in Lebanon; alternative names are : The Ahbash, Habashis, al Habashiyyin, and Jam'iyyat al- Mashari' al-Khayriyya al-Islamiyya (in English, Association of Islamic Charitable Projects - AICP).

It follows the teachings of Shaykh Abdallah ibn Muhammad ibn Yusuf al-Hirari al-Shibi al- Abdari, also known as al-Habashi ("the Ethiopian"), an interpretation of Islam combining elements of Sunni and Shi'a theology with Sufism. It advocates pluralism, and opposition to political activism and violence (its slogan is "the resounding voice of moderation"). It also promotes its beliefs internationally through a major Web presence and regional offices, notably in the United States.

It is highly controversial within Islamism for its religious stance (anti-Salafi, and with Sufi and other beliefs seen as heretical) and its political alliances (pro-Syria and conciliatory toward the West).

The question is why would such 2 groups work together on such a crime ?

Many analysts don't find a lot of common ground between these 2 groups. The only common thread is their loyalty to Syria's Assad regime... Both groups are staunch allies of Syria.

Last night Ahmad Jibril, who lives in Damascus, appeared on LBC TV and strongly denied any involvement. It will now be left to the courts to decide. Jibril promised last night to appear in a Lebanese court if summoned.

Souces: Ya Libnan, LBC TV , UPI , wikipedia