GAZA CITY (CNN) — Israeli airstrikes pounded targets in Gaza on Saturday, killing at least 170 people, Palestinian medical sources said. An Israeli army spokeswoman said her country is ready to continue the attacks “as long as it takes.”

Palestinian medical sources said 110 people were hospitalized in Gaza in serious to critical condition. Earlier Saturday, the sources said at least 250 people had been wounded in the raids.

The militant group Hamas, which controls the government in Gaza, vowed to retaliate.

The strikes followed several days of rocket attacks from Gaza into Israel.

Hamas police stations were hit, killing many senior police commanders, a reporter in Gaza said.