Israel's air force raided a Hamas training camp in the Gaza Strip overnight Sunday, without causing any injuries, witnesses said.
The target was in the Gaza refugee camp of Nusseirat.
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In recent days, Palestinian activists have fired rockets into southern Israel from the Gaza Strip, without any casualties, according to the Israeli army.
A radical Salafist splinter group has claimed responsibility for some of the attacks.
Despite an informal truce between Hamas and Israel, tensions flare periodically on the Gaza-Israel border, with Palestinian militants firing rockets into the Jewish state and the Israeli military launching retaliatory air strikes on the Palestinian territory.
The last major flare-up was in June, when militants fired more than 150 rockets at southern Israel, wounding five people, and Israel hit back with air strikes that killed 15 Palestinians.