MOSCOW, March 19 (Xinhua) -- Moscow expressed deep concern Tuesday over the use of chemical weapons by the Syrian opposition forces.
"Information coming from Damascus indicates that the use of chemical weapons by the armed opposition was recorded in the Aleppo province early on March 19," the Russian Foreign Ministry said in an online statement, referring to a detonation of a possible war gas ammunition bomb that left 16 people killed and some 100 injured.
Describing the incident as "a new and extremely alarming and dangerous turn in the events in the Syrian crisis," the ministry said Moscow was "seriously concerned by the fact that weapons of mass destruction have gotten into militants' hands."
The situation in the war-torn country was worsening with confrontation brought to "a new level," it said.
Moscow urged again all relative forces in Syria to stop violence and start a political settlement with the government within the framework of the Action Group's Geneva Communique reached on June 30, 2012.
Meanwhile, the United States said on Tuesday that "no evidence" shows that the Syrian rebels have used chemical weapons.
"We have no evidence to substantiate the charge that the opposition has used chemical weapons," White House spokesman Jay Carney said at a regular press briefing.
He warned of "consequences" should the government of President Bashar al-Assad uses the weapons or fails to secure them, and reiterated Washington's position that it will not supplying lethal assistance to the opposition.