He made the comments at a meeting with a group of teachers and academics in the capital Tehran on the occasion of National Teachers' Day, according to a statement published on his website on Wednesday.

Khamenei said America's behavior was a sign of its "partnership and complicity" with Israel in its "horrible crimes and unforgivable sins".

He described the Gaza conflict as a "world issue" and urged more global pressure on Israel to stop its offensive into the Palestinian territory, Xinhua news agency reported.

More than 1,000 pro-Palestinian protesters have been arrested in recent days as anti-war demonstrations continued at more than 2 US universities, US media reported on Tuesday.

Pro-Palestinian rallies have spread to other academic centers around the world, including Europe, demanding an end to Israel's attacks on Gaza.

Israel has launched a massive offensive against Hamas in Gaza since October 7, 2023, after Hamas launched a surprise attack on southern Israel that killed nearly 1,200 people.

According to Gaza health officials on Wednesday, 34,568 people have died and 77,765 have been injured so far in the ongoing Palestinian-Israeli conflict.