The Palestinian Islamic Jihad declared on Sunday that its gunners fired a salvo of Russian-made Katyusha missiles on northern Israel. The group made the declaration in a statement, released in the Lebanese capital, coinciding with duels in southern Lebanon involving Israeli artillerymen and the Lebanese Islamic resistance movement, Hezbollah.The clashes broke out hours after Israeli warplanes pounded bases for the Popular Front for the Liberation of Palestine -- General Command -- in south and southeast Lebanon. Israel said the air strike was in retaliation for the missile attack that wounded one Israeli soldier. Islamic Jihad has accused Israel of being behind assassination of a commander of the group and his brother in a bomb blast in the southern city of Sidon last Friday, and vowed revenge.