NEW : Europe aide says tape tries to justify `` slaughter of innocent people '' Tape allegedly of bin Laden claims Al Jazeera behind terror attempt . `` Afghanistan will not dream of enjoying safety '' bin Laden purportedly says . Tape aired on the Arabic -language news Web site Al Jazeera .
NEW : Obama aide says tape tries to justify `` slaughter of innocent people '' Tape allegedly of Osama bin Laden claims al Qaeda behind terror attempt . `` The United States will not dream of enjoying safety '' bin Laden purportedly says . Tape aired on the Arabic-language news Web site Al Jazeera .