One woman has been killed when an Israeli missile struck a house in Khan Younis in southern Gaza.
Another 14 Palestinians, some of them reported to be children, were injured.
Witnesses said the apparent target of the strike had been a car but the missile instead struck the house.
This morning, a US-based rights group accused Israel of conducting an incomplete investigation into the deaths of eight Palestinian civilians on a Gaza beach earlier this month.
Human Rights Watch demanded an international inquiry into the explosion and said the Israeli investigation was incomplete because it excluded important evidence.
The group made the call after meeting Meir Klifi, the general responsible for the Israeli army's internal inquiry into the 9 June incident.
The army probe has cleared the military of any wrongdoing and Israeli Prime Minister Ehud Olmert has rejected calls for an international investigation.
Marc Garlasco, a senior military analyst at HRW, said 'an investigation that refuses to look at contradictory evidence can hardly be considered credible'.
HRW, which conducted its own investigation at the scene of the explosion, believes that the blast was caused by an Israeli shell fired several hours earlier which later exploded.
The group said the army had fired 'more than 80 such shells in the area of the beach' on the morning of 9 June.
Palestinian killed in West Bank clashes
A Palestinian militant has been shot dead by Israeli troops in clashes in a northern West Bank refugee camp.
He has been named as Dahoud Katouni, 24, a member of the al-Aqsa Martyrs Brigades, which is loosely affiliated to the Fatah party of moderate Palestinian leader Mahmoud Abbas.
Two other gunmen, including another al-Aqsa member, were wounded in the exchanges, which occurred in the Ain Beit Ilma refugee camp near the restive Palestinian city of Nablus.
The Israeli military said an army unit came under fire and returned fire at a gunman, killing what it described as 'senior operative' in the al-Aqsa faction.
The violence comes amid an escalation in Israeli-Palestinian tensions.
An Israeli air strike aimed at militants killed two children and a teenager in the Gaza Strip yesterday.
An unmanned aircraft fired at least one missile at a car carrying members of al-Aqsa Martyrs Brigades in Gaza City.
The intended targets managed to leap free but a seven-year-old girl, a five-year-old boy and a 16-year-old were killed.
14 others were wounded in the attack.
