President Joe Biden said on Wednesday that American bombs have been used by Israel to kill Palestinian civilians.

“Civilians have been killed in Gaza as a consequence of those bombs and other ways in which they go after population centers,” Biden said during a CNN interview when asked whether the 2,000-pound bombs sent to Israel have killed civilians. The White House last week halted a weapons shipment that included this type of bomb.

If the Israeli military launches a ground offensive in Rafah, a city in Gaza where more than one million people are sheltering, the White House will not supply “the weapons that have been used historically to deal with Rafah to deal with the cities,” Biden said.

“We’re not going to supply the weapons and the artillery shells used,” Biden said.