United Nations Secretary General Kofi Annan says he believes another investigation will be necessary into last month's assassination of former Lebanese prime minister Rafik Hariri.

In a speech Wednesday to Arab leaders meeting in Algiers, Mr. Annan said that within the next few days he expects to release a report on a fact-finding mission into the February 14th killing. But he added that another more comprehensive probe might be necessary.   

News reports from Lebanon say the U.N. fact-finding report is expected to accuse Lebanese authorities of negligence and evidence tampering.

Lebanon's pro-Syrian government has said it was investigating the massive bombing in Beirut that killed Mr. Hariri.  But there has been no official statement on the probe. 

Meanwhile, Mr. Annan said he expected the withdrawal of Syrian troops from Lebanon to be completed before Lebanese parliamentary elections set for May.

Some information for this report provided by AP, AFP, Reuters.