Borrell on his part condemned all attacks on civilians and called for the "release of all hostages".
"Gaza is in complete blackout and isolation while heavy shelling continues," Borrell said on social media. "Far too many civilians, including children, have been killed. This is against International Humanitarian Law," he said, adding: "A pause of hostilities is urgently needed to enable humanitarian access."
Israel is now 22 days into its bloody war against the Palestinians and has so far killed at least 7,700 people in near-constant bombardments on the Gaza Strip, including some 3,500 children, according to the Palestinian health ministry.
Borrell condemned all attacks on civilians and called for the "immediate and unconditional release of all hostages".
Late on Friday, Israel stepped up its air campaign on Gaza, turning hundreds of buildings and thousands of houses into rubble.
The UN High Commissioner for Human Rights Volker Turk warned earlier on Saturday there was the potential for thousands more civilians to die if Israel presses a major ground offensive in Gaza.
*This story was edited by Ahram Online
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