
Are the following mentions coreferent?:
<m> bombed </m> in A refugee camp in South Sudan's Unity state was bombed, South Sudan officials and witnesses said, threatening to raise tensions with Sudan in the violence- plagued border region. A Reuters correspondent heard a large explosion in the Yida refugee camp, then saw a crater about two meters ( 6. 6 feet ) wide, an unexploded bomb wedged in the side of a school building and a white aircraft flying north. 
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<m> attack </m> in An Israeli mortar strike that killed about 40 Palestinians sheltering in a UN school Tuesday brought new urgency to diplomatic efforts to end Israel's military onslaught in the Gaza Strip. The Israeli army said the UN school in the Jabaliya refugee camp was hit when troops responded to a mortar attack from the grounds and that the dead included a number of Hamas militants. The mortar strike in Jabaliya was the second attack on a school run by the UN Relief and Works Agency, or UNRWA. 