The Israeli military fired missiles at four smuggling tunnels and a weapons depot in Gaza late on Friday, it said.
The attacks came after two rockets were fired from Gaza into southern Israel, the military said.
The tunnels link the Gaza strip with Egypt and are used to smuggle goods and weapons into Gaza.
The latest strikes come nearly three weeks after Israel ended a devastating 22-day offensive in Gaza where more than 1,300 Palestinians were killed.
During the fighting, 10 Israeli soldiers and three civilians were killed.
Friday's strikes come just days before Israel's general election on Tuesday.