Israel has launched an air strike on the Gaza Strip for the first time since an eight-day war ended in a truce in November 2012.
According to Hamas, the Islamist group that runs Gaza, aircraft bombed fields near the border and no-one was injured.
The Israeli move comes after a Palestinian rocket attack on Israel on Tuesday which also caused no injuries.
Israel and Hamas have been observing an Egyptian-mediated truce after last November’s fighting.
The Israeli military confirmed the air strikes, saying it had targeted “terror sites” and was “in response to rocket fire”.
According to Israeli newspaper Haaretz, the air strike was near the northern Gaza town of Beit Lahiya and came after militants in Gaza fired two mortar shells into the western Negev desert.
Since the truce came into effect, Israel has eased restrictions on allowing building materials into the Gaza Strip, imposed when Hamas came to power there in 2007.