The latest casualties are five members of the radical Islamist movement Hamas, four of whom died in an Israeli air raid on Gaza City.
Earlier, a Palestinian woman was pronounced "clinically dead" after she was hit by Israeli tank fire while protesting outside a mosque against the incursion aimed at halting militant rocket fire.
Mussada al-Huwaihi, a captain in the Palestinian intelligence services, was hit while demonstrating with a handful of other women outside the mosque in the northern Gaza city of Beit Hanun where around 100 Palestinian men had taken refuge, they said.
Israeli tanks laid siege to the mosque after the men fled into the complex to avoid demands by the Israeli army that all men between the ages of 16 and 45 should gather at the local stadium, witnesses said.
The tanks retreated after about two hours and the men left the mosque, the witnesses said.
One Hamas militant was later killed by an air raid on the Jabaliya refugee camp, and two civilians were killed by a second raid in the same area, medics said.
Israel said the targeted men had fired rockets at the Israeli city of Sderot, wounding two people.
Earlier in the day, medics said four other Palestinians including a 70-year-old man and two militants, were killed by Israeli fire in Beit Hanun, which was reoccupied by Israeli forces when they launched Operation Autumn Clouds early yesterday.
During the day, Israeli helicopters hovered above the town as smoke rose from several buildings amid sporadic machine gun fire and explosions.
In an Arabic-language radio broadcast, the army urged residents to stay indoors: "The Israel Defence Force has entered Beit Hanun and asks all the inhabitants to stay at home until further notice," it said.
Many residents were heeding the warnings.
"We haven't moved from here for two days," said Abu Luay Zaanin from his home on the outskirts of town. "They are shooting at anything that moves."
In all, 15 Palestinians and an Israeli soldier have been killed in the operation, one of Israel's largest since militants seized a soldier in June.
More than 60 people, including three women and 10 children, have been wounded.
Palestinian security sources said that around 100 alestinians had been detained during the operation in the town that Israeli officials said had become a launch pad for militants firing rockets into the Jewish state.
General Yoav Galand told army radio that "our aim is to apply permanent pressure on the terrorists to make the firing of rockets more difficult".
But the incursion by infantry units, backed up by tanks and air support, has failed to stop the rocket fire.
Three more hit Israeli territory today, lightly wounding two people, after eight were fired yesterday when one person was slightly wounded.
Abbas and the head of the Islamist-led government, prime minister Ismail Haniya, both condemned the new Israeli offensive, describing it as a "massacre."
Israel has repeatedly said that it has no intention of re-occupying the Gaza Strip.