IMPORTANT UPDATE BELOW
 CTV

Syria's state media say rebels have fired a chemical weapon in the north of the country, killing 15 people.

The report by the official SANA news agency marks the first time the government has accused fighters seeking to topple President Bashar Assad of using chemical weapons.

It says "terrorists" fired a rocket "containing chemical materials" into the Khan al-Assal area in the northern province of Aleppo on Tuesday. The regime regularly uses the term terrorists to refer to rebels fighting Assad's forces.

SANA says around 15 people, most of them civilians, were killed and a number of others were wounded.

 Really, "the first time"? According to the NATO media outlet making the claim.
"The regime regularly uses the term terrorist"- That is the most accurate descriptor to the nation of Syria and the Syrian people
Also notice the western media uses the "chemical weapon" meme. While Syria actually reported on the use of "chemical materials"


SANA: Terrorists Launch Rocket Containing Chemical Materials on Khan al-Asal in Aleppo Countryside- Mar 19, 2013

ALEPPO,(SANA)- Terrorists on Tuesday launched containing chemical materials on Khan Al-Asal in Aleppo Countryside.

Initial information shows that about 15 citizens were killed, and others injured

Do I doubt this report regarding NATO's mercs using chemicals materials of some sort
Absolutely not.
This is not the first time NATO mercs have used some sort of chemicals.
The first time the mercs injured themselves.
This time, perhaps with all that extra aid from the NATO nations, they may have been able improve their attacking skills.

I had initially covered  reports of NATO mercs using some sort of chemicals here (December 2012) At that time the Israeli media was spinning hard on a need to attack Syria.
Refresh your memory, please.

This is in a rebel held area : Allegations of a 'gas attack'

Poisonous gas' used in a rebel-held neighbourhood in Homs, medics there say: 

Also:

 What makes this 'story' appear all the more false is that the alleged casualty count is 7. Yes, allegedly this gas attack resulted in just 7 dead.

Back to the latest:

This news of  NATO's mercs using some sort of chemicals, comes hot on the heels of yesterday's strike near the Lebanon border. Just who struck the area near Lebanon is anyone's guess.
If you missed that news, it is linked below.

 Strikes near Lebanon border: Syria? Israel? The US?


UPDATE !!!

US rejects Syrian claim that rebels used chemical weapons
 Check out the victim photo: Syrian Army Soldier. Regular Syrian Army

 A U.S. official is rejecting the claim of Bashar Assad regime's that Syrian rebels (NATO mercs) used chemical weapons in an attack that allegedly killed 16 people and injured around 100 others. 

 Russia said that the evidence of rebels getting hold of weapons of mass destruction had taken the confrontation to a new stage.