"They are fully aware of what has happened… We are still trying to establish exactly what happened. Both sides have influence on those who have access to these kinds of weapons so we are giving that information to them," Jens Laerke told RIA Novosti.
Laerke called for an investigation into the incident.
"It’s easy to blame this and blame that but… that’s very dangerous to do, it’s premature to do this before you have established the facts," the official said.
According to Laerke, both the Damascus forces and the opposition groups were aware of the fact that the convoy would attempt to deliver aid, and had given permission for it to do so.