The story

The Israeli military surrounded densely populated Gaza City late Monday as the death toll mounts in Gaza.

Israeli security sources said they surrounded the city of about 400,000 in their operation against Hamas.

Military officials also said "friendly fire" killed three Israeli troops late Monday in an explosion in northern Gaza.

Two dozen other troops were wounded -- one critically and three severely -- in the explosion. The troops were part of the Golani Brigade, and their commander, Col. Avi Peled, sustained minor injuries.

The explosion was caused by a tank shell that hit a building the troops were in, officials said. Read full article »

CNN's Talal Abu Rahma in Gaza City and Michal Zippori in Jerusalem contributed to this report.

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