What were osama bin ladens demands for blowing up the twin towers?

Osama made no demands in connection with the attack; he just announced it was retribution for support of Israel. He stated in a December 27, 2001 video:

"Terrorism against America deserves to be praised because it was a response to injustice, aimed at forcing America to stop its support for Israel, which kills our people"

In 1996, bin Laden issued a fatwā calling for American troops to get out of Saudi Arabia and this was used as justification for the attacks.