
Are the following mentions coreferent?:
<m> according to </m> in According to news agency reports, two Israeli tank shells struck the school in Jabaliya refugee camp, spraying shrapnel on people inside and outside the building. 
</s>
<m> saying </m> in 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. 