The UK Ministry of Defense has claimed that chemical weapons were used in the Syrian conflict. Forensic evidence was collected after scientists analyzed soil smuggled out of the country in a secret British operation, the Times reported.

The sample was reportedly extracted from a neighborhood on the outskirts of Damascus in March by MI6 agents operating within Syria, the Australian reported at the time.

The soil was then smuggled out of Syria and handed over to UK Ministry of Defense’s chemical and biological research department.

Military scientists said the soil contained traces of “some kind of chemical weapon,” though they could not positively identify the type of weaponized chemical.

“There have been some reports that it was just a strong riot-control agent but this is not the case – it’s something else, although it can’t definitively be said to be sarin nerve agent,” one source told the Times.

The British team was unable to say whether the chemical had been used by Syrian government forces or rebel fighters battling to topple the government of President Bashar Assad. They were further unable to determine to what extent chemical weapons had been used in the ongoing civil war.

The analysis provided the basis for diplomatic reports on Thursday that the West had “hard evidence”that chemical weapons had been deployed over the course of the two-year conflict.

“In one case, we have hard evidence,” one diplomat was quoted by AFP as saying, adding that “there are several examples where we are quite sure that shells with chemicals have been used in a very sporadic way.”

Medics and other masked people attend to a man at a hospital in Khan al-Assal in the northern Aleppo province, as Syria's government accused rebel forces of using chemical weapons for the first time on March 19, 2013 (AFP Photo / Sana)

The Ministry of Defense has yet to comment on the report, though the UK Foreign Office told AFP it was “deeply concerned” about the potential use of chemical weapons.

"We have shared our concerns with the UN secretary general and fully support his decision to investigate,”a spokesperson said.

"The use of chemical weapons would be a horrific crime. Those who order the use of chemical weapons, and those who participate in their use, will be brought to account," they continued.

The soil analysis conducted by the UK team has yet to be scrutinized by an independent body.

On Monday, UN Secretary-General Ban Ki-moon pressed Damascus to accept an expanded UN inquiry into alleged chemical weapons use in the country.

Assad previously called on the UN to investigate reports that “a missile containing a chemical substance” was fired by “terrorists” in the village of Khan Assal near Aleppo in March, killing 30 and injuring 80 more.

Photo by Aleppo University Hospital

However, the investigation stalled after Damascus refused to allow UN inspectors to go anywhere but Aleppo, even though reports have surfaced of similar attacks in Homs and near Damascus the same month.

During a state visit to Israel in March, US President Barack Obama said the use of chemical weapons in Syria would be a “game changer.” In reference to the Aleppo attack, Obama said he planned on working with other countries in the region and international organizations and institutions to “find out precisely whether this red line was crossed.”

However, sources within the British Department of Defense told the Times the discovery had not provided the “Iraq moment” – a deadly 1988 chemical attack by Saddam Hussein against Kurds in Halabja.

They added that the evidence might not provide a “smoking gun,” demonstrating that Damascus had crossed the “red line” for direct US action outlined by Obama.

Medics and other masked people attend to a man at a hospital in Khan al-Assal in the northern Aleppo province, as Syria's government accused rebel forces of using chemical weapons for the first time on March 19, 2013 (AFP Photo / Sana)

Photo by Aleppo University Hospital

Photo by Aleppo University Hospital

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