The IDF said the buildings belong to the Popular Resistance Committees and were used for terror infrastructure and that the residents were warned to leave before the strike.
The first strike, by a helicopter gunship firing two missiles, targeted the house of a leader of the Popular Resistance Committees terror group in Shathi refugee camp outside Gaza City. Residents said a person walking outside was wounded.
Minutes later, an Israeli warplane bombed the home of a military commander from Hamas in nearby Jabalya refugee camp.
An Israeli military spokeswoman said the air strikes, which came hours after a Palestinian rocket salvo from Gaza killed a woman in Israel, targeted terrorist arms caches and other terror infrastructure.
Palestinian sources further reported that the IAF attacked three Hamas structures in Rafah, located in the southern Strip; no injuries were reported.
The military said it had targeted a weapons cache belonging to Islamic Jihad.
Hanan Greenberg contributed to the report