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(CNN) – At least 16 people were killed and many more were wounded when a U.N. shelter in northern Gaza was hit during Thursday's fighting, officials said.
"What is clear is that our schools, our facilities of the U.N. Relief and Works Agency, UNRA, are clearly marked. We've given out the coordinates for those schools," said Farhan Haq, deputy spokesman for the U.N. Secretary General.
"This was one of those that is sheltering Palestinian refugees from are the fighting in Gaza," said Haq.
More than 140,000 Palestinians displaced by the fighting in Gaza have taken refuge in UNRA schools, says Haq.
"We've made clear where those schools are, and the fact that there are civilians in them. So they shouldn't have been attacked by anyone. And if there was any military activity, there shouldn't have been any military activity near those schools, either. But whether or not there was activity nearby would not excuse anyone firing at the schools," he said.
For more of our interview with the U.N.'s Farhan Haq, check out the video above.