The raids were on targets in Beit-Lahya and northern Gaza, said a member of the security service of Hamas, which controls the enclave.
An Israeli military spokesman confirmed a raid on "terrorist sites" in the Gaza Strip.
Palestinian militants in the Gaza Strip fired two rockets into southern Israel on Tuesday evening, damaging a farm outbuilding but causing no casualties, Israeli police said.
The previous rocket attack, on Sunday, triggered a retaliatory Israeli air strike on a Hamas military base in which a Palestinian was killed and several people wounded, among them two policemen and a French consular official and his family living nearby.
Low-level unrest has rumbled in and around Gaza this month but has not deteriorated into all-out fighting as it did on October 29-30 when tit-for-tat violence left 12 Palestinian militants and an Israeli civilian dead.
Militant groups say they are observing an Egyptian-brokered truce agreement but have reserved the right to reply to any Israeli fire, while Israel has said it will target any militants poised to fire rockets across the border. (*)
Editor: Kunto Wibisono
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