Terrorists in Gaza sent a mortar shell crashing into an open area in southern Israel on Monday.
Over the past two months, terrorists in Gaza have been firing sporadically across the border, ending a period of calm that followed November’s Operation of Pillar of Defense.
"A mortar shell struck an uninhabited area in the Eshkol region near the security fence between Israel and the Gaza Strip," an army spokeswoman said according to the AFP news agency.
The incident came 24 hours after Israeli warplanes launched air strikes against the southern Gaza town of Khan Yunis, targeting weapons depots and a training site for the armed wing of Islamic Jihad, the military said.
The strikes, which came in response to a rocket that hit open fields in southern Israel on Saturday, caused no casualties.
Prime Minister Benjamin Netanyahu told Sunday's weekly cabinet meeting that Israel would retaliate with great force against any rocket or missile fire.
"I want to make it clear that we will respond in a very offensive way against any rockets or missiles. We will take all necessary measures to ensure the security of Israelis... on all fronts," he said.
Israel had not carried out air raids on Gaza since early April, when it launched the first strikes in response to rocket attacks launched by Hamas terrorists in the Gaza strip.
On April 19, two rockets fired from the Gaza Strip hit southern Israel without causing any casualties or damage.
Netanyahu had last week vowed Israel would "exact a price" from the Gaza terrorists who fired missiles from Sinai at the southern resort city of Eilat on April 17.