The story

A U.N. agency is demanding Israel back up its claims that Hamas was firing on Israeli forces from a U.N. school compound in northern Gaza, forcing Israeli artillery to shell the area and kill more than 40 Palestinian civilians.

"We have nothing to hide," U.N. Relief and Works Agency spokesman Chris Gunness said. "Bring it on. We want to see the evidence, we want to clear any suspicion."

Gunness, whose agency runs several schools in Gaza, spoke about Tuesday's incident in Jabalya in a joint CNN interview with Israeli Foreign Ministry spokesman Yigal Palmor, which at times became quite heated. Read full article »

CNN's Shira Medding contributed to this report.

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