More than 200 children have been killed in Gaza since the conflict began three weeks ago, the U.N. Office for the Coordination of Humanitarian Affairs reported. In the last 24 hours, 74 Palestinians, including 10 children and six women, are reported to have been killed, or their bodies identified. The 10 Palestinian children were reportedly killed when a missile struck a park in Beach Camp.

U.S. Secretary of State John Kerry said Tuesday in Washington the Obama administration is working hard to seek an immediate cease-fire between Israel and militant group Hamas as the number of Palestinian civilian deaths in Gaza continues to rise.

"We are working very carefully, and I think thoughtfully, with our Israeli friends in order to be able to find a way to reduce the civilian loss of life, to prevent this from spiraling downwards into a place from which, you know, both sides have difficulty finding a way forward in order to address the underlying kinds of issues," Kerry said.

The U.N.'s most recent report states 1,065 Palestinians have been killed, including at least 795 civilians, of whom 229 were children and 118 were women. Some 6,233 Palestinians have been injured, including 1,949 children and 1,160 women, as of July 27. The number of Israelis killed has reached 47, including two civilians, 44 soldiers and one foreign national. But the fighting has continued in Gaza since the U.N. gathered its latest report, so the number of casualities may actually be higher by now.