'Nightline' Daily Line, Sept. 12: U.S. Ambassador Killed

6:53 p.m. ET: Al Qaeda has released a new video of American hostage Warren Weinstein delivering a personal message to Israeli Prime Minister Benyamin Netanyahu.

Read the full details HERE

Credit: ABC

5:06 p.m. ET: Earlier today, Mitt Romney said President Obama's response to the attacks on American facilities in Libya and Egypt was "disgraceful" and denounced what he called the administration's "apology for America's values."

Read the full details HERE and watch what happened here:

3:48 p.m. ET: Want to see what's happening at New York City's Fashion Week? Well, there's this:

Credit: Jason DeCrow/AP Photo

Designer Betsey Johnson goes into a split after doing a cartwheel on the runway after the Betsey Johnson Spring 2013 collection show during Fashion Week, Sept. 11, 2012, in New York.

Last summer, "Nightline" went inside the secret lives of runway models and what it takes to become one. Watch what happened here:

2:40 p.m. ET: It's HERE!! Behold, the iPhone 5

Credit: David Paul Morris/Bloomberg via Getty Images

Apple Inc. today announced its new iPhone, as well as changes to its iPod line and iTunes software, at a press event in San Francisco.

In short, the "world's thinnest smartphone" is a whole new phone, matching many of the rumors that had been floating around about its introduction for months.

Read the full specs HERE

12: 35 p.m. ET: President Obama today strongly condemned a deadly overnight attack on the U.S. consulate in Benghazi, Libya, calling the murder of four Americans there an "outrageous and shocking" act and vowing to "bring to justice the killers."

Read his full remarks HERE

Credit: Alex Wong/Getty Images

9:33 a.m. ET: BREAKING: U.S. ambassador to Libya Christopher Stevens was killed by a "small and savage group" of Libyan militants who stormed the U.S. consulate in Benghazi.

Read the story as it develops HERE

An man waves his rifle as buildings and cars are engulfed in flames after they were set on fire inside the U.S. consulate compound in Benghazi Sept. 11, 2012. (STR/AFP/GettyImages)