Gaza skyline after Israeli counter-attack against Hamas _ USA TODAY

The rapidly intensifying war between Israel and Palestinian militants roared through a second day Sunday, with the Israeli Security Cabinet formally declaring war and the death toll surpassing 1,100 — a figure that may include some Americans.

More than 600 Israelis have been killed since Hamas militants began their assault Saturday on almost two dozen Israeli towns and army bases, ZAKA, a volunteer group that handles human remains after terror attacks, told Israeli media. ZAKA said 250 bodies were found at a music festival near the Gaza border. As of Sunday evening, more than 123,000 people in Gaza were displaced due to fear and concerns about the destruction of their homes, according to the United Nations.

Dozens of Israelis, and apparently some Americans, were taken hostage, officials on both sides said. Palestinian authorities said more than 300 fighters and civilians have been killed by Israeli counterattacks in Gaza. Each side reported thousands of wounded.