It was six weeks ago on Tuesday that terrorists attacked the U.S. Consulate in Benghazi, Libya.

Now, CBS News has obtained email alerts that were put out by the State Department as the attack unfolded. Four Americans were killed in the attack, including Ambassador Christopher Stevens.

These emails contain the earliest description so far of what happened at Benghazi the night of the attack. 

Read the emails

The emails, specifically mention that the Libyan group called Ansar al-Sharia had asserted responsibility for the attacks.

The brief emails also show how U.S. diplomats described the attack, even as it was still under way, to Washington.

U.S. Ambassador Christopher Stevens and three other Americans were killed in the Benghazi assault, which President Barack Obama and other U.S. officials ultimately acknowledged was a "terrorist" attack carried out by militants with suspected links to al Qaeda affiliates or sympathizers.

Administration spokesmen, including White House spokesman Jay Carney, citing an unclassified assessment prepared by the CIA, maintained for days that the attacks likely were a spontaneous protest against an anti-Muslim film. Read more on this story at Reuters.