The administration informally notified the weapons package to Congress, which will need to approve it, a US official said, while a congressional aide who also requested anonymity said the weapons bought from US weapons makers amounted to around $1 billion.

The weapons would come out of a major $95 billion package recently approved by Congress in defense support for Ukraine, Israel and Taiwan, and the Biden administration has repeatedly said it planned to go ahead and appropriate the funds through purchases from US manufacturers.

But the deal comes a week after Biden warned that he could withhold bombs and artillery shells to Israel if Prime Minister Benjamin Netanyahu went ahead in defiance of US warnings with an assault on Rafah, the southern Gaza city where more than one million Palestinians have taken shelter after half a year of war.

The Biden administration also confirmed last week that for the first time it had halted a shipment that includes 2,000-pound bombs, fearing they would be used with devastating risks for civilians in Rafah.

Congress could still block the weapons sale to Israel, with left-leaning members of Biden's Democratic Party outraged by the toll on civilians in the Gaza war.

But the overall package passed despite opposition from the left, with the rival Republican Party almost unanimously in support of arms for Israel.

The Wall Street Journal first reported the new arms package. It said it could potentially include $700 million in tank ammunition and $500 million in tactical vehicles.