The inspection team, which is expected on Monday to present U.N. Secretary General Ban Ki-Moon with a highly anticipated report on a suspected Aug. 21 nerve agent attack in the suburbs of Damascus, will not directly accuse the Syrian regime of gassing its own people, according to three U.N.-based diplomats familiar with the investigation. But it will provide a strong circumstantial case — based on an examination of spent rocket casings, ammunition, and laboratory tests of soil, blood, and urine samples — that points strongly in the direction of Syrian government culpability.

“I know they have gotten very rich samples — biomedical and environmental — and they have interviewed victims, doctors and nurses,” said the Western official. “It seems they are very happy with the wealth of evidence they got.” The official, who declined to speak on the record because of the secrecy surrounding the U.N. investigation, could not identify the specific agents detected by the inspector team, but said, “You can conclude from the type of evidence the [identity of the] author.”…

While Western diplomats say they are confident that U.N. report would strengthen the case against the Syrian government, they said they expected the case would not fundamentally alter the course of diplomatic efforts to contain the chemical weapons threat in Syria. “It’s not a game changer,” said one diplomat.