Al-Qaida's No. 2 leader lashed out at US President-elect Barack Obama in a new audio recording released Tuesday, blaming him for not doing anything to stop Israel's offensive in Gaza, according to an intelligence monitoring center. The audio recording was al-Qaida's first comments on the Gaza offensive since Israel launched it on December 27. In the audio comments, which were posted on a militant Web site and obtained by the SITE Monitoring Service, Ayman al-Zawahiri described Israel's actions in Gaza as a "crusade against Islam and Muslims" and "Obama's gift to Israel" before he takes office later this month. "This is Obama whom the American machine of lies tried to portray as the rescuer who will change the policy of America," al-Zawahiri said, according to SITE. "He kills your brothers and sisters in Gaza mercilessly and without affection."