The blame/credit for this attack has been passed around quite a bit today:
1) A senior commander of a Palestinian militant group, speaking on condition of anonymity, said the Lebanese guerrilla group Hezbollah (search), which is funded by Iran and has been trying to disrupt the cease-fire, hired a Palestinian from the northern West Bank to carry out the bombing. Palestinian security officials also implicated Hezbollah.
A Hezbollah official in Beirut denied involvement: "As far as we are concerned, there is no need to respond to such lies."
http://www.foxnews.com/story/0,2933,148782,00.html2) According to Israeli news outlets, the Al-Aqsa Martyrs Brigades, the militant wing of Hamas, claimed responsibility for the attack in a telephone call.
Hamas, through it’s spokesman Sami Abu Zuhri said that his organization was “fully observing the period of quiet, as we told Abu Mazen at our last meeting in Gaza. But the responsibility lies with the Israeli enemy, because even though we are observing this period of quiet, the Israeli aggressions and crimes are continuing”. The Palestinian Islamic Jihad also denied any role in the attack on the Tel Aviv disco on behalf of which it’s spokesman Nafiz Azzam declared “Islamic Jihad is committed to calm in accordance with the understanding it has reached with President Abu Mazen. The Islamic Jihad has no knowledge of the attack in Tel Aviv.”
http://www.arabmonitor.info/news/dettaglio.php?idnews=8855&lang=en3) The senior commander who implicated Hezbollah is a leader of the Al Aqsa Martyrs' Brigades, which is loosely tied to Abbas' Fatah party. Al Aqsa has largely honoured Abbas' efforts to maintain a recent ceasefire with Israel. But elements of the militant group, which comprises many autonomous cells, are widely believed by Israeli and Palestinian officials to have received orders and funding from Hezbollah.
Palestinian security officials, speaking on condition of anonymity, said they had tracked recent communications between Hezbollah militant Kais Obeid and a Palestinian who they believed was the attacker. They did not name the attacker.
Hezbollah's television station, Al Manar, reported the Palestinian militant group Islamic Jihad had claimed responsibility but the group, as well as the Palestinian militant group Hamas, both issued denials of involvement.
http://www.cbc.ca/cp/world/050225/w022579.htmlI only say it odd because there is usually no reluctance to claim responsibility for such attacks by the perpetrators.
BTW, Al-Aqsa is not affiliated with Hamas as stated in the second report.