With the Israeli campaign in Gaza in its 19th day, the Palestinian death toll was reported to pass 1,000.
Gaza's Health Ministry says 1,010 Palestinians have been killed in the fighting, including some 400 women and children.
Hamas fired more rockets into southern Israel, causing no casualties. But Israel says 10 soldiers and three civilians have been killed by Hamas rockets in the past few weeks.
The Israeli military says its aircraft bombed 35 arms-smuggling tunnels under the Gaza Strip's border with Egypt. The tunnels also provide a lifeline for Palestinians in the blockaded Gaza Strip.
In the besieged city of Gaza, the Israeli military also says it struck Hamas police headquarters, weapons storage facilities, a cemetery, and eight squads of gunmen.
In Cairo, UN Secretary-General Ban Ki-moon renewed his call for "an immediate and durable ceasefire" between Israel and Hamas.
Meanwhile, rockets were fired from Lebanon into northern Israel for a second time in less than a week, but no one was hurt. Israel responded with artillery shelling.
With Israeli troops edging closer into Gaza City, aid agencies expressed growing concern about the plight of children trapped there with dwindling food, water and power supplies.