That was RT mischief making and the die-hard conspiracy people ran with it even to the extend of claiming that actors were used. The BBC responded to the claims.
Media Lens :: View topic - Reply from BBC re Syria news/Panorama edit issue
https://www.metabunk.org/rt-claims-b...esponds.t3341/
The BBC did a follow up piece on the casualties.
http://www.bbc.co.uk/news/world-24288698