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Syrian activist groups reported on Wednesday another suspected chemical attack in the northwestern province of Idlib, with one group tweeting that a dozen people were "suffocating,” The Associated Press reported.

Several Idlib-based groups said government helicopters dropped at least two barrel bombs containing chlorine on the town of Saraqeb, triggering cases of suffocation.

The Syrian Network for Human Rights, which is based outside the country, tweeted that 12 people were "suffocating."

The reports could not be independently verified. A call to Syria's mission to the U.N. rang unanswered Wednesday evening.

The head of Syria's main opposition group in exile said he received the reports during his informal meeting with the U.N. Security Council behind closed doors.

Khaled Khoja with the Syrian National Coalition said he urged the council to act on its resolutions, including one adopted last month that threatens action against the use of chemical weapons in Syria.

Activists have reported several attacks since then, and the council earlier this month heard from a Syrian doctor who treated victims from a half-dozen of them. "Everyone smelled bleach-like odors" and heard the sound of helicopters, Mohamed Tennari said of one incident.