Damascus, Sep 17 (IANS) At least 34 children have died in rebel-held Syria after being injected with contaminated measles vaccines, the rebels have claimed. The province is being held by moderate rebel groups opposed to both Syrian President Bashar al-Assad, and the extremist Islamic State (IS) (also k**wn as ISIS). Parents, however, blamed opposition health authorities of failing to store the vaccines properly, and of supplying out-of-date medication.