Israeli Prime Minister Benjamin Netanyahu vowed to continue fighting.
Japan is prepared to provide further humanitarian aid to Gaza, totalling around $65 million.
The health ministry in Gaza said the Israeli air strikes in Gaza City killed dozens of people.
Israel has asked the United States for $10 billion in emergency aid amid the escalation of the Palestinian-Israeli conflict.
The Israeli military has pulverised the Gaza Strip with missiles in reply, with a ground offensive also being prepared – a move likely to increase the death toll.
It is also because of its uranium and oil reserves that it has economic and strategic importance for the United States, Europe, China, and Russia.
Foreign Minister Annalena Baerbock said at the Ukraine Recovery Conference in London.
During his two-day visit, Mr Blinken met with President Xi Jinping and had talks with top foreign policy official Wang Yi and Foreign Minister Qin Gang.
Earlier on Saturday, U.S. Secretary of State Antony Blinken said representatives of the Sudanese army and the rival paramilitary Rapid Support Forces (RSF) had agreed on a seven-day ceasefire.
