Two strikes were confirmed by the Israeli army, which said they came in response to Palestinian rockets fired at Israeli territory the previous night.
Two people were wounded in the Nuseirat refugee camp in the central Gaza Strip. The other raid, on the Jabaliya refugee camp north of Gaza City, did not result in any casualties.
An army spokeswoman said one raid targeted a centre of activities by the Hamas Islamist movement which rules the Strip, while the other was aimed at an arms workshop.
Tensions have been rising in recent weeks, with Palestinian militants inside the enclave firing a series of rockets at Israel, which has retaliated with air raids.
The renewed tensions come two years after Israel's devastating "Operation Cast Lead" offensive against Gaza in response to rocket and mortar fire. The war killed 1,400 Palestinians, mostly civilians, and 13 Israelis, 10 of them soldiers.