Israel has killed 122 people in Gaza, including 31 children and 20 women, and wounded 900, according to the Health Ministry.
“The myth of shared values is coming to an end,” a Palestinian American activist said.
Victory Day in Russia, Eid al-Fitr celebrations and officials at the U.S. border round out this week's most stunning images.
Israeli artillery pounded northern Gaza early Friday in an attempt to destroy a vast network of militant tunnels inside the territory.
Israel carried out an intense barrage of airstrikes just after sunrise, striking dozens of targets in several minutes that set off bone-rattling explosions across Gaza.
After speaking to the Israeli prime minister, Biden said he hopes violence “will be closing down” soon, but didn't mention the Palestinians killed in Israeli airstrikes.
The fighting between Israel and Hamas was the most intense since a 50-day war in the summer of 2014.
“We have sirens. Let’s go. Let’s go. Let’s go," CNN Jerusalem correspondent Hadas Gold told her crew as the warning sounded in Ashkelon, north of Gaza.
Hamas and other armed groups fired rockets toward Israel in an escalation of the conflict sparked by weeks of tensions in Jerusalem.
It's the latest in a series of confrontations between Israeli police and Palestinians that threatened to push the contested city toward wider conflict.