Palestinian militants have fired a rocket at Israel from the Gaza Strip, in violation of a four-month-old truce.
After the attack, Israeli troops closed cargo crossings into Gaza, which they control, until further notice.
It is the second such strike within 10 days, both of which were claimed by a previously unheard-of group calling itself Hezbollah Palestine.
Rocket barrages from Gaza largely ended after Israel and militant groups agreed a truce in June.
The rocket fired on Thursday morning slammed into an empty field in southern Israel, without causing any damage or casualties.
Israel and Egypt have blockaded the overcrowded and impoverished Gaza Strip since the Hamas militant group seized control of the territory in June 2007.
After the 19 June ceasefire took effect, Israel allowed more goods to enter Gaza, but there remain severe shortages and exports are banned.
On Wednesday, Israeli troops killed an elderly Palestinian farmer during a raid in the northern West Bank, after the army said the man opened fire at them with a shotgun.
Relatives of Muhammad Abahreh from Yamoun village said he had been carrying the gun to ward off sheep rustlers.
"He was locking the gate and he heard something around us. He thought that it was thieves, so he went out with his shotgun and was shot immediately," his son Taher told Voice of Palestine radio.
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