GAZA, Sept. 4 (Xinhua) -- Israel on Saturday night launched three airstrikes on southern Gaza Strip targets, mainly tunnels under the borders between Egypt and the enclave, wounding four Palestinians, witnesses said.

According to witnesses, Israeli F-16 warplanes carried out three airstrikes, the first targeted a tunnel east of the southern Gaza Strip city of Khan Younis, the warplanes then struck two other tunnels used for smuggling, wounding at least four Palestinian workers who were then in one of the tunnels.

Medics in Rafah town said rescue teams have found a wounded worker while efforts are exerted to take the other three out of the tunnel.

Israeli airstrikes came after a homemade rocket was fired earlier by Gaza militants at southern Israel. No injuries or damages were reported.

The Gaza-based pro-Hamas Popular Resistance Committees (PRC) claimed responsibility for the rocket attack.