Israel has carried out more air strikes in the northern Gaza Strip.
Israeli forces have continued air strikes on Gaza
Buildings linked to the Hamas movement were targeted, and officials say in one attack several people were injured.
Earlier, Israel's Deputy Defence Minister Ephraim Sneh warned that no Hamas leader was immune from a strike, including Palestinian PM Ismail Haniya.
Separately, Palestinian Authority President Mahmoud Abbas arrived in Gaza to discuss internal fighting that left 50 dead before a truce was called.
West Bank raids
More than 30 Palestinians have died in Israeli strikes in the past week.
Israel launched the offensive in response to Palestinian rocket attacks on its territory.
Local health officials say several people were injured in a house east of the Jabaliya refugee camp in northern Gaza. Children are among the casualties.
Most of the Palestinians killed in Israeli strikes have been militants, but 11 civilians are reported to have been killed.
The official Palestinian news agency says Israeli forces detained 22 Palestinians in overnight raids in the West Bank.
The agency said 16 had been seized in the Bethlehem area, four around Hebron and two in Tulkarm.
The Israeli military said it had detained eight suspected Palestinian militants, but gave no further details.
Israel also said it had struck at two camps in Gaza. Hamas said one building used by its private militia, the Executive Force, was destroyed.
Correspondents say Hamas leaders have gone underground and switched off their mobile phones to avoid detection.
Israel has long pursued what it calls targeted killings against Palestinian militants and political leaders linked to militant groups, including the highest political leaders of Hamas.
"The political branch of Hamas gives its green light to those who fire rockets," Mr Sneh said.
"Therefore its members are terrorists and none of them benefit from immunity."
Hamas official, Sami Abu Zuhri, told Reuters news agency: "Any harm to Prime Minister Haniya or any Hamas leader would mean a change in the rules of the game and [Israel] must be ready to pay an unprecedented price."
On Monday, an Israeli woman died of her wounds after a rocket fired from the Gaza Strip hit her car in the southern border town of Sderot. Shirel Feldman, 35, was the first Israeli to die in a rocket attack since November.
Sixteen Israelis have been injured over the past seven days and hundreds have fled Sderot, which is often targeted.
Meanwhile, the latest truce in Gaza between Palestinian factions Hamas and Fatah appears to be holding, after days of bitter civil fighting on the streets of the strip.
About 50 people have died in the recent clashes between the two Palestinian groups.
President Abbas was scheduled to meet Mr Haniya to discuss ways to strengthen the truce.
Eyewitnesses said Mr Abbas's motorcade was heavily defended, with loyal security personnel manning rooftops and closing key routes.