Chief U.N. investigator Daniel Bellemare has reportedly pinned down suspects with direct involvement in the 2005 assassination of former Prime Minister Rafik Hariri.

The daily As Safir, citing a U.N. source, said Wednesday that Bellemare would not disclose the names of the suspects.

The source said Bellemare is likely to announce in early December the completion of a major part of the probe and his readiness to take over as prosecutor general for the international tribunal to try suspects in the Hariri killing.

As Safir said Bellemare is also likely to announce before the U.N. Security Council in December the names of 120 suspects.

"But those 120 suspects are not accused of involvement in Hariri's assassination," the source said, adding that the international tribunal would interrogate them under oath.