A United Nations special prosecutor has pledged to find the truth behind the assassination of former Lebanese Prime Minister Rafik Hariri. Daniel Bellemare issued a statement Friday saying his team will do everything possible to ensure that justice is served. Bellemare is the chief prosecutor of a special U.N. tribunal that will begin trying the case in The Hague, Netherlands, on Sunday. The special court is tasked with investigating the massive truck bombing that killed Mr. Hariri and 22 others in Beirut on February 14, 2005. Its mandate can be expanded to related crimes only under strict conditions and within a set timeframe. U.S. President Barack Obama called Lebanese President Michel Suleiman on Thursday to express his support for the tribunal.

The rights group Amnesty International on Friday said the tribunal is a positive step, but its focus is too narrow to gain public confidence.  Amnesty said other measures are needed to "address the grave human rights abuses of the past, as well as those that continue in the present."On Thursday, Lebanon’s justice minister said he is confident the tribunal will determine who killed Mr. Hariri. Ibrahim Najjar also said Lebanon will fully cooperate with the special court.On Wednesday, a Lebanese judge ordered the release on bail of three suspects held in connection with the assassination. The judge did not give any reasons for releasing the three civilians.  In a separate ruling on Friday, the same judge, Saqr Saqr, denied an appeal to release four other suspects, all former top security officials and Lebanese generals.

UNITED NATIONS (Reuters) – The future prosecutor in a U.N. court that hopes to try the murderers of former Lebanese Prime Minister Rafik al-Hariri pledged on Friday to do everything to "eventually" bring those guilty to justice.

In a statement to mark the opening on Sunday of the court near The Hague in the Netherlands, Daniel Bellemare said he would pursue a "principled approach based solely on facts and evidence" and would not be swayed by political considerations.

Bellemare, a Canadian who has been leading a Beirut-based investigation of Hariri’s February 14, 2005, killing and will now become the court prosecutor, declared that the tribunal "is not after revenge; it is after justice."

Hariri and 22 others were killed in a suicide truck bombing in Beirut that anti-Syrian Lebanese politicians, including his son Saad al-Hariri, have blamed on neighbouring Syria.

Syria denies the charges but the killing sparked a worldwide outcry that forced it to end a 29-year military presence in Lebanon. Investigators have yet to publicly name any suspects.

"We will not be deterred by the obstacles or the size of the challenge," Bellemare said in the statement issued at the United Nations. "We are persistent. We will go wherever the evidence leads us. We will leave no stone unturned."

"I want to reassure everybody that my team and I will do everything that is humanly and legally possible to ensure that the truth emerges and that those responsible for the crimes that fall within our jurisdiction are eventually brought to justice," he added.

Bellemare has said the opening of the court does not mean legal proceedings will start immediately, and that investigations will continue.

In his statement he gave no new information on the state of the inquiry, but said his team would continue to maintain a field office in Beirut that serves as a base for investigators who would make regular visits to Lebanon.

(Reporting by Patrick Worsnip; editing by Mohammad Zargham)