Need to Know News: U.S. ambassador to Libya killed; Protesters attack U.S. diplomatic compounds in Egypt, Libya

Each day, we here at "Piers Morgan Tonight" put together the news you need to know – from what happened last night to what will happen today.

For September 12, 2012 – Obama condemns killing of U.S. ambassador to Libya, protesters attack U.S. diplomatic compounds in Egypt and Libya and Atlanta police clear white officers of profiling in Tyler Perry case...

• Obama condemns killing of U.S. ambassador to Libya: "U.S. President Barack Obama on Wednesday strongly condemned the killing of the United States ambassador to Libya, J. Christopher Stevens, in a rocket attack on the U.S. Consulate in the city of Benghazi on Tuesday."

• Protesters attack U.S. diplomatic compounds in Egypt, Libya: "The United States said it was taking measures to protect its citizens worldwide after protesters angry about an online film considered offensive to Islam attacked U.S. diplomatic compounds in Libya and Egypt on Tuesday, killing an American."

• Chicago school strike hits third day: "Talks were set to start again Wednesday morning with Chicago's school board and striking public school teachers seemingly miles apart from reaching a deal to get 350,000 children back in school."

• U.S. credit rating hinges on Congress and Moody's: "Moody's said Tuesday it would likely strip the United States of its sterling AAA rating if lawmakers fail to produce a long-term debt reduction plan next year."

• Atlanta police clear white officers of profiling in Tyler Perry case: "Two white Atlanta police officers who pulled over and questioned entertainment mogul Tyler Perry have been exonerated of racial profiling by an internal investigation, according to documents released Tuesday."
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