Israel, Hamas escalate heavy fighting with no end in sight

  • Jewish nationalist demonstrators take cover during a barrage of rockets fired from the Gaza Strip toward central Israel, in the Israeli town of Ramla, Tuesday. The protesters had gathered in an attempted show of strength in a predominantly Arab neighborhood. (AP Photo/Heidi Levine)

  • Smoke caused by Israeli airstrikes is seen on a residential building in Gaza City, early Wednesday. (AP Photo/Khalil Hamra)

  • Jacob Simona stands by his burning car during clashes with Israeli Arabs and police in the Israeli mixed city of Lod, Israel, Tuesday. (AP Photo/Heidi Levine)

JERUSALEM — Israel stepped up its attacks on the Gaza Strip, flattening a high-rise building used by the Hamas militant group and killing at least three militants in their hideouts on Tuesday as Palestinian rockets rained down almost nonstop on parts of Israel.