The Israeli military said a third rocket fired by Palestinian militants in the Gaza Strip slammed into southern Israel Thursday night, but there were no immediate reports of injuries.
It followed two earlier rocket attacks. In both cases the projectiles fell on open ground.
Israel often responds to such activity with air strikes into Gaza.
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On Tuesday, Gaza's Hamas rulers said they had redeployed a 600-strong special security force tasked with preventing cross-border rocket fire, after reports it had pulled the unit back two days before.
Hamas spokesman Islam Shahwan said the Palestinian Islamist movement would "not allow the occupation (Israel) to break off the ceasefire" that ended an eight-day, full-scale conflict with the Jewish state in November 2012.
The Hamas force was deployed on January 21, but withdrawn at the weekend as a protest after four Israeli air strikes on Hamas training camps in the strip.
While Hamas itself does not routinely fire rockets, Israel says it holds the group, which seized power in Gaza in 2007, responsible for such attacks.