Palestinians may be gratified to see American university campuses erupt in outrage over Israel's offensive in Gaza, but some in the embattled enclave are also wondering why no similar protests have hit the Arab countries they long viewed as allies.

"Violent protest is not protected. Peaceful protest is. It's against the law when violence occurs. Destroying property is not a peaceful protest. It's against the law," Biden said. "Vandalism, trespassing, breaking windows, shutting down campuses, forcing the cancellation of classes and graduations, none of this is a peaceful protest."

Students at a university in Mexico rallied and set up a camp in support of the Palestinians and to show solidarity with students protesting in the United States against the war in Gaza.