Israeli warplanes carried out a raid on the Gaza Strip early Tuesday seriously wounding three people, according to Palestinian medical sources.
The raid targeted Zeitun east of Gaza City, the sources said, and came after an Israeli police spokesman said a rocket had been fired from the Gaza Strip at the southern town of Beersheva, without causing casualties.
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An Israeli military spokeswoman questioned by AFP did not immediately confirm or deny the attack.
Israeli public radio said a second rocket had been fired at Beersheva, but it was not known where it fell.
Since last month there has been an increase in the number of rockets fired at southern Israel from the Gaza Strip followed by Israeli air force reprisal raids after several months of calm following a flare-up in April when an anti-tank missile hit an Israeli school bus, killing a teenager.
Israel responded to that attack with a series of air strikes that killed at least 19 Palestinians in the deadliest violence since Israel's devastating 22-day assault on Gaza in December 2008-January 2009.