A senior figure in the Fatah-affiliated Aksa Martyrs Brigades was critically wounded Tuesday in a clash Golani Brigade troops in the Casbah of Nablus. The troops noticed a group of armed Palestinians and opened fire, shooting Ahmad Sankara, who managed to escape. Palestinian sources said that Sankara had been hit in his stomach and his hand. An IDF source told Army Radio that Sankara was responsible for planting bombs and shooting at Israelis, as well as planning other terror attacks. The soldiers found and confiscated an M-16 rifle, which may have been Sankara's own weapon. None of the troops were wounded. Also Tuesday, a Kassam rocket fired at Israel from the northern Gaza Strip landed in open territory in the western Negev. No wounded or damage were reported. Overnight Monday, Palestinians opened fire at IDF troops operating in Jenin and detonated an explosive device near an IDF jeep. None of the soldiers were wounded and no damage was reported. In arrest operations overnight Sunday, IDF troops arrested 13 suspected terrorists throughout the West Bank. Four Fatah operatives were caught near Nablus and Ramallah, while eight fugitives from Hamas and the Islamic Jihad were arrested near Bethlehem. Another suspect was arrested south of Hebron.