
Are the following mentions coreferent?:
<m> caused </m> in The attack on the Prep C girls school in the Jabaliya camp was the worst in more than a decade, said by the United Nations's director of operations in Gaza, John Ging. It was the worst attack on a school in decades, and it has left more than 50 people with serious injuries. 
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<m> used </m> in Mr. Ging said that they have established beyond any doubt that the school was not being used by any militants. He further said that they were innocent people. 