Sept. 16 (UPI) -- Israel began its ground offensive in Gaza City, the Israeli Defense Forces have confirmed.

An IDF official said forces have advanced from the outskirts of town toward the center of the city, The Guardian reported.

"Last night we began deepening our operations deeper into Gaza City," the IDF official told The Guardian. "It's a gradual thing. It is not a black or white thing. But yesterday was a big step forward ... in operations on the ground."

The person added that IDF troops were expecting to meet significant resistance from up to 3,000 Hamas and its allied fighters in Gaza City.

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