
Are the following mentions coreferent?:
<m> said </m> in Military aircraft from Sudan crossed the new international border with South Sudan and dropped bombs Thursday in and around a camp filled with refugees, officials said. An American activist who spoke to aid workers at the camp later said there were no casualties. The president of South Sudan, which became the world's newest country only four months ago, said he fears the Khartoum-based government intends to invade the south soon. 
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<m> explain </m> in Israel moved quickly to explain the attack on the Jabalya school, saying its forces had been fired on first. John Ging, the top UN refugee official in Gaza, said UN staff and Palestinian families in the school compound had been screened for weapons, and he disputed Israel's claim that mortars were fired from inside. 