This exacerbates the danger from the wide-area effect of the submunitions the rockets contain.

CNN: The gruesome toll of deadly cluster bombs in Syria

But Britain, France, Germany, the Netherlands, Sweden, and Switzerland all want exemptions for sophisticated weapons with low failure rates or small numbers of submunitions.

ECONOMIST: Cluster weapons

Many countries, including Lebanon and Cambodia, have experienced civilian casualties from similar types of submunitions, both at the time of attack and from submunitions that didn't explode on initial impact.

CNN: The gruesome toll of deadly cluster bombs in Syria

Evidence we have seen suggests that Syrian government forces delivered the 122mm cluster munition rockets containing submunitions using a BM-21 Grad multi-barrel rocket launcher, a truck-mounted system capable of firing 40 rockets nearly simultaneously with a range of 4 to 40 kilometers (2.5 to 25 miles).

CNN: The gruesome toll of deadly cluster bombs in Syria