Lebanon's President, Emile Lahoud, is a staunch ally of Syria who opposed the Cedar Revolution.
Lebanon's presidency has been vacant since pro-Syrian President Emile Lahoud's term ended late last year.
The presidency has been vacant since pro-Syrian President Emile Lahoud's term ended in November.
He said Lebanese President Emile Lahoud and Prime Minister Salim Hoss had both agreed to the move.
Mr Hariri has long feuded with Lebanon's president, Emile Lahoud, whose mandate was due to expire last month.
In addition, the report hints that Emile Lahoud, the pro-Syrian president of Lebanon, might also have been in on the plot.
But the UN report claims that Mr Lahoud received a phone call from one of the conspirators minutes before the bombing.
But he again fell out with his pro-Syrian government colleagues during the crisis over the extension of President Lahoud's term in office.
"We have hit a point of zero violations of the line, " Mr Roed-Larsen told reporters on Monday after meeting Lebanese President Emile Lahoud.
Commentators warn that if the Lebanese Parliament does not elect a pro-Syrian presidential candidate next week, then Lahoud is liable to call general elections.
"The Secretary-General and President Lahoud agreed that when we hit this point of zero violations Unifil should be redeployed in the south, " said Mr Larsen.
Also looming in the next few months is the election by parliament of a (Maronite Christian) president to replace the pro-Syrian Emile Lahoud whose term ends on 25 November.
BBC: NEWS | Middle East | One year on: Lebanon political paralysis
He was twice prime minister but fell out with Mr Lahoud and left office in 2004 to campaign for an end to Syria's military and intelligence presence in Lebanon.
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