In the first month of its war in Gaza, Israel dropped hundreds of massive bombs, many of them capable of killing or wounding people more than 1,000 feet away, analysis by CNN and artificial intelligence company Synthetaic suggests.

Satellite imagery from those early days of the war reveals more than 500 impact craters over 12 meters (40 feet) in diameter, consistent with those left behind by 2,000-pound bombs. Those are four times heavier than the largest bombs the United States dropped on ISIS in Mosul, Iraq, during the war against the extremist group there.

Weapons and warfare experts blame the extensive use of heavy munitions such as the 2,000-pound bomb for the soaring death toll. The population of Gaza is packed together much more tightly than almost anywhere else on earth, so the use of such heavy munitions has a profound effect.

“The use of 2,000-pound bombs in an area as densely populated as Gaza means it will take decades for communities to recover,” said John Chappell, advocacy and legal fellow at CIVIC, a DC-based group focused on minimizing civilian harm in conflict.