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While the message didn't detail the circumstances of Yazid's death, it did say his wife, three of his daughters, a granddaughter and others were killed, according to SITE.

Yazid, an Egyptian national, is believed to be a financial manager for al Qaeda, as well as a co-founder of the terrorist group, according to SITE.

A U.S. official speaking on condition of anonymity said the government has "strong reason to believe" that Yazid was killed recently in Pakistan's tribal areas.

"In terms of counterterrorism, this would be a big victory," the official said, noting that Yazid was al Qaeda's prime conduit to leader Osama bin Laden and his deputy, Ayman al-Zawahiri.