The first air strikes on the southern Gaza city of Khan Yunis killed and wounded another man, Palestinian sources said.

The Israeli military confirmed the attack, saying it had targeted a member of movement who "was involved in planning a attack in the heart of Israel."

"This operation disrupts the execution of the attack by movement," an Israeli army spokeswoman said.

"That organisation has been involved in the firing of rockets towards Israeli territory and IDF forces (army) in the past few days," she added.

Adham Abu Selmiya, spokesman for the Hamas-run health services in the Gaza Strip, named the dead man as 25-year-old Mohammed Jamil al-Najar.

The Al-Quds Brigade, the armed wing of the organization group, said Najar was a member and pledged revenge for the attack.

Later raids hit three sites used by Hamas security south of Gaza City and also a training base of the organization in Khan Yunis, but caused no further casualties, Hamas officials and eyewitnesses said early on Wednesday.

The Hamas facilities housed offices of the Hamas National Security Service and its naval wing, they said.

An Israeli military spokesman confirmed only that aircraft had hit three "terror targets" in response to recent rocket and mortar fire from Gaza.