The sources added that the missiles caused excessive property damage, and that the seven wounded Palestinians suffered mild-to-moderate injuries.
One of the strikes targeted a security intelligence center, run by the Hamas-led security forces, northwest of Gaza City, in the besieged coastal region.
The missiles also hit several nearby civilian homes, while one child suffered mild injuries and was moved to a local hospital.
Medical sources in Beit Lahia, in northern Gaza, said two more Palestinians have been wounded when the army fired missiles close to the Bissan Recreational City.
Eyewitnesses said that the army also fired two missiles near the Ferdous Mosque, north of Rafah city, in the southern part of the Gaza Strip, leading to four injuries among the residents. All four required hospitalization.
In addition, the Israeli air force fired missiles into a center run by the al-Qassam Brigades, the armed wing of Hamas, in Rafah, causing damage but no injuries.