Five Palestinians were wounded in the northern Gaza Strip in four separate shooting attacks Thursday, just a day after Hamas and Fatah leaders agreed to stop the chaos that has plagued Gaza. Neither Hamas nor Fatah officials blamed the other side for the violence. The two groups have been in a power struggle since Hamas won January parliamentary elections. In one attack, two brothers who are Fatah members were moderately wounded when masked men in a car shot at their vehicle between the northern Gaza towns of Jabaliya and Beit Lahiya, hospital officials and witnesses said. Three Hamas members in different locations in northern Gaza were also shot and wounded, one as he walked to mosque, another as he stood outside his house and the third in a drive by shooting, Hamas officials said. No one claimed responsibility for any of the attacks. Palestinian security officials said they were investigating the incidents.