Palestinians flee their homes to take shelter at the United Nations school in Gaza City, Sunday, July 13, 2014. Israel briefly deployed ground troops inside the Gaza Strip for the first time early Sunday as its military warned northern residents to evacuate their homes, part of a widening campaign against militant rocket fire that's seen more than 160 Palestinians killed. Israel accuses Hamas of using Gaza's civilians as human shields by firing rockets from there. Critics say Israel's heavy bombardment of one of the most densely populated territories in the world is itself the main factor putting civilians at risk. (AP Photo/Hatem Moussa)
GAZA CITY, Gaza Strip (AP) -- The uncle of four Palestinian boys who were killed in an Israeli naval strike today is calling it a "cold-blooded massacre."
The four -- ages 9 to 11 -- were killed during the bombardment of a coastal area in the Gaza Strip. Israel says it's investigating what happened.
The boys' uncle says "with all of the advanced technology they claim they're using," Israel should have been able to identify them as kids. A Palestinian doctor says the four boys were killed while playing on a beach off a coastal road west of Gaza City. Seven others were wounded in the strike. A Palestinian activist says it came from an Israeli naval vessel operating offshore.
Israeli warplanes also intensified attacks across the Gaza Strip today, targeting senior Hamas leaders. The airstrikes targeted 30 houses -- including those of some senior Hamas leaders.
Hamas, meanwhile, fired dozens of additional rockets into Israel. A Hamas official says the militant group feels "alone in the field" with little support from the Arab world. He wants Palestinian President Mahmoud Abbas to support the Hamas rejection of a cease-fire proposed by Egypt.