Obama Administration officials have revealed that the US has now completed DNA tests showing with 100% certainty that Al Qaeda leader Osama bin Laden has been killed.

The officials did not immediately say where or how the testing was done, but the test explains why President Obama was confident to announce bin Laden's death to the world Sunday night.

What is more, CIA's facial recognition technology has identified Bin Laden's face with 95% certainty, according to a US government official as cited by NBC.

World's No. 1 terrorist Osama bin Laden was shot dead by US forces in Pakistan on Sunday after he had been for the September 11 attacks for almost 10 years.

A senior U.S. official told Fox News that a Navy SEAL from Team Six, a top military counterterrorism unit, identified Bin Laden by his face. The official said the Al Qaeda leader did not appear to be ravaged or starved from his years in hiding, saying it appeared Bin Laden had been living well.

The official also said the SEALs used "facial recognition pulls" to confirm Bin Laden's identity on site by comparing his height, ears, nose and mouth to known photos of him.

The official said the White House is still deciding on when and how to released the photo of Bin Laden to avoid any conspiracy theories about his death. The official said it is believed that only the U.S. is in possession of the photo.

Asked how the sea burial of Osama bin Laden complies with Islamic law, officials say the Koran is not specific to burial - as long as the body of the diseased is cleansed quickly; there is no single authoriative Islamic text on burial, NBC reported.