Israeli vessels, early Sunday, opened fire on Palestinian fishing boats sailing north of Gaza city, according to local sources. The Palestinian sources said that Israeli naval forces opened their machine-gun fire at Gazan fishing boats in al-Sudaniya sea to the northwest of the Gaza Strip, but no injuries were reported. Also early on Sunday, Israeli soldiers arrested 6 Palestinian fishermen in Deir al-Balah sea in the central parts of Gaza besieged enclave. The Israeli soldiers pulled the boat to unknown area, the sources added.