GAZA CITY, Gaza Strip (AP) — Israel killed a string of senior Hamas military figures Wednesday and pounded three multistory towers as it hammered the Gaza Strip with airstrikes and militants in the territory fired rocket barrages. Dozens have died in the worst violence since a 2014 war, with no resolution in sight.

The fighting has taken on many hallmarks of that devastating 50-day conflict between Israel and Hamas, but with a startling new factor: a burst of fury from Israel’s Palestinian citizens in support of those living in the territories as well as counterviolence by Jewish Israelis.

In response, Israel deployed border guards in two mixed Arab-Jewish cities that saw unrest in previous days, including the burning of a Jewish-owned restaurant and a synagogue, the fatal shooting of an Arab man and attacks on Arab-owned cars. It was a rare use of the paramilitary force, which normally puts down protests by Palestinians in the West Bank and east Jerusalem.

Palls of gray smoke rose in Gaza, as Israeli airstrikes struck apartment towers and blasted multiple Hamas security installations. In Israel, hundreds of rockets fired by Gaza’s Hamas rulers and other militants at times overwhelmed missile defenses and sent air-raid sirens and explosions echoing across Tel Aviv and other cities.

The death toll in Gaza rose to 53 Palestinians, including 14 children and three women, according to the Health Ministry. At least 320 have been wounded, including 86 children and 39 women. Seven have been killed on the Israeli side by rocket fire, including the first death of an Israeli soldier in this round of conflict.

The other deaths have been civilians, including three women and two children, one of them a 6-year-old killed in a rocket strike on an apartment building in city of Sderot. Dozens in Israel have been wounded.

There was no sign that either side is willing to back down. Prime Minister Benjamin Netanyahu has vowed to expand the offensive, saying it “will take time.” Hamas has called for a full-scale intifada, or uprising. The last such uprising began in 2000 and lasted more than five years.