After Harrison Mann’s resignation from the U.S. military was finalized on Monday, the Jewish U.S. Army major who worked in the Defense Intelligence Agency gave a pair of interviews this week explaining his decision to resign over American support for Israel’s war on the Gaza Strip.

“We saw, even from the first days of the Israeli air campaign, willingness to inflict very high civilian casualties,” Mann toldCBS News chief investigative correspondent Jim Axelrod in a conversation that aired Tuesday.

Even before the Hamas-led October 7 attack prompted the ongoing Israeli bombardment, ground assault, and restrictions on humanitarian assistance deliveries into Gaza, the United States gave Israel billions of dollars in annual military aid. U.S. weapons and diplomatic support for the Middle East ally has increased over the past eight months, as the death toll has topped 36,500.

Journalists and human rights groups have documented Israel’s use of U.S. arms to kill and injure civilians in Gaza. Asked by Axelrod whether Israeli forces were intentionally doing so, the Mann responded, “I don’t know how you kill 35,000 civilians by accident.”