An exchange of gunfire in the northern West Bank town of Jenin killed four Palestinians, three of them children, Palestinian hospital officials said. Twenty other Palestinians were wounded. 

Israel's army did not immediately comment on the shooting, which Palestinian security officials said occurred during a break in the curfew imposed by Israeli forces. 

The dead were Ahmed Ghazawi, about 6; his 12-year-old brother Jamil; a 6-year-old girl, Sajedah Famahwi; and Helal Shetta, who is about 50, a doctor at the hospital said on condition of anonymity. At least 20 Palestinians were wounded, according to Palestinian officials. 

Israeli troops moved into Jenin after 19 Israelis were killed in a suicide bombing in Jerusalem. The bombing prompted a major government policy shift to gradually reoccupy Palestinian land until terror attacks on Israeli civilians stop.