Israeli air raids on the Hamas-ruled Gaza Strip overnight Monday targeted a training camp of the Ezzedine al-Qassam Brigades, the armed wing of Hamas, Al Arabiya reported.
The second raid occurred in the northern part of the strip near the community of Beit Lahiya, security sources told Agence France-Presse.
The air strikes caused no casualties, unlike a raid on Sunday which critically wounded a Palestinian, who the Israeli army said was a "key" figure responsible for cross-border rocket fire.
Tensions have risen in and around Gaza after a year of relative calm, with army figures showing 33 rockets have been fired at southern Israel since the start of 2014.
The increase in Israeli raids and Palestinian rocket attacks as well as border incidents in the last few weeks raise the possibility of a major new confrontation between Israel and the Hamas movement, which has run Gaza since 2007.