Israeli aircraft struck new targets in the Gaza Strip on Monday, killing two fighters, after the government vowed to press home an offensive despite international appeals for an end to Israeli massacres.

More than 110 Palestinians, many of them civilians, have been killed since Israel launched offensives on Wednesday. Among these have been women and children, provoking an outcry from Palestinians and fellow Arabs and condemnation at the United Nations and elsewhere.

Four workshops and an office used by Hamas were blasted overnight, said Hamas officials.

Two groups of fighters were also struck by missiles. In each attack, one man was killed and several wounded, medics and Hamas officials said.

The Israeli defense minister Ehud Barak said the offensive would go on: "It is time for action. The operation continues. Hamas is responsible and will pay the price ... We will deploy force to change the situation -- and we will change it."

On Saturday, 61 people including 30 civilians were killed in the bloodiest day for Palestinians since their 1980s uprising.

Six Israeli civilians were wounded on Sunday when rockets hit border towns. Two soldiers were also wounded, the army said.

On Saturday, two soldiers were killed and seven wounded.

Hamas says it fires rockets in self-defense and that it would stop if Israel halted all military activity in Gaza and the occupied West Bank and ended its embargo on the Gaza Strip.

Areas used by fighters to launch rockets have seen fierce battles between hundreds of Israeli troops backed by tanks and Palestinian gunmen who have laid ambushes for advancing units.

Many of the civilian casualties have come when Israeli missiles fired by helicopters, jets and unmanned drones have hit buildings and homes randomly.

Amid anti-Israeli demonstrations in the West Bank, Israeli troops shot dead a youth near Hebron, witnesses said.

Saudi Arabia said on Sunday Israel was emulating "Nazi war crimes."

Egypt opened its border crossing with Gaza, which has been sealed off as part of Israel's efforts to blockade Hamas, to let some 40 wounded Palestinians receive care in Egyptian hospitals.

PHOTO CAPTION

Palestinians gather at the site of an Israeli air strike in Rafah town in the southern Gaza Strip.