Palestinians in the Gaza Strip fired three rockets at southern Israel on Saturday night, the Israeli army said, the second attack in 24 hours.
"Three projectiles were recognised to have been launched from the Gaza Strip into Israeli territory," the English-language WhatsApp statement said.
"Two projectiles were intercepted by the Iron Dome aerial defence system." There were no reports of casualties but police said that a rocket fragment fell on a house in the southern town of Sderot.
The Israeli army's statement did not say what happened to the third rocket. Rockets falling in uninhabited areas after dark are often not located until daylight.
Air raid sirens had sounded in Sderot and its surroundings.
Later, the army reported that an attack helicopter and tank fired at "a number of armed suspects adjacent to the (border) fence in the northern Gaza Strip."