Hello and welcome to our live coverage of the conflict in Gaza. Sunday has seen the heaviest bombardment of Gaza since the Israeli offensive began. The Palestinian leadership has condemned as a massacre the killing of at least 60 people in one neighbourhood of Gaza, Shejaiya. Thousands of Palestinian civilians are fleeing the area. Meanwhile rocket fire from the strip, into Israel, has continued. Hamas also claims it carried out a major attack on Israeli forces in Gaza, causing multiple casualties - although Israel has not commented on this.
Paramedics say rescue workers have so far not been able to get to East Shejaiya, an area very close to the Israeli border, which has seen heavy shelling. The death toll in the area is expected to rise.
Palestinians are fleeing Shejaiya in their thousands amid scenes of panic. Israel says it is targeting militants operating in the area, and that it has been warning civilians to evacuate for days.
16:30 Breaking News
Some 13 Israeli soldiers were killed overnight in Gaza, news agencies, quoting Israeli military sources, say. Israeli Prime Minister Benjamin Netanyahu is expected to address the nation shortly.
The Israel Defense Forces twitter account in Hebrew (@idfonline) says the dead soldiers are from the Golani Brigade, an Israeli infantry unit.
Daniel Taub, Israeli ambassador to the UK, tells the BBC: "This area Shejaiya is a very densely populated area in Gaza, [it also has] densest concentrations of Hamas activity. We know that underneath this area are stockpiles of weapons, terrorist headquarters."
More on that BBC Arabic interview with Israel's PM. Mr Netanyahu said that the area of Shejaiya in Gaza under attack today is a "terror stronghold" and is a centre for rockets that are fired out to Israel. He defended the Israeli assault on Gaza saying that Israeli soldiers came under heavy fire when they entered the area in search of tunnels. He said they had no choice but to enter densely populated areas and says that they asked civilians to leave.