Malaysia Airlines Flight 17 is not the first passenger jet to be shot out of the sky.
At least six airlinersÂ have been shot down since 1973.
Among the deadliest: Iran Air Flight 655 involving a U.S. Navy ship.
CNN's George Howell has the story.
Another wave of U.S. military personnel arrived in Iraq Thursday as the deadly battle for control of the country rages on.
A bomb blast inside northern Baghdad killed 19 people and wounded 41 more. That comes a day after a suicide attack at a market south of Baghdad killed 13 people, and a car bomb explosion in northern Kirkuk killed six more people and wounded 21 others.
OutFront, CNN Military Analyst - Retired Colonel Peter Mansoor - who was the executive officer to General David Petraeus during the surge in Iraq. Also joining us, CNN Counterterrorism analyst and former CIA official Phil Mudd.
CNN has a rare look inside the former U.S. embassy in Iran where dozens of American diplomats were held and tortured by Iranians for 14 months in 1979.
Many may remember it from the Hollywood hit, Argo.
Today, the embassy is an anti-American museum, but it looks almost exactly like it did 34 years ago.
CNN's Jim Sciutto has the exclusive footage.
(CNN) - The family of Bob Levinson, who disappeared from Iran seven years ago, has long known he worked for the CIA - a fact they once feared disclosing because the U.S. government told them it could put Levinson in even more jeopardy. Now, they believe it could be the key to bringing him home.
Members of Levinson's family offered the revelation in an interview with CNN on Tuesday, in which they accused the U.S. government of failing to do enough to find and free the missing American and prodded it to act before it's too late.
The family said it's time for the government to lay out the facts about Levinson's case.
"I hope they are hearing our request that (U.S. government officials) acknowledge what he was doing over there and they understand that the family does want this acknowledged now," the missing man's son, Dan Levinson, said. "And we think it would be more of a positive step to getting him home."
The family of a man who was kidnapped in Iran nearly seven years ago is now demanding a meeting with the FBI, saying the U.S. government has 'abandoned' him.
Last week, several major news outlets reported that Robert Levinson, a former FBI agent, who went missing in March of 2007 was actually working undercover for the CIA.
According to the reports, the FBI, the State Department and even the White House knew of Levinson's CIA connection, but continued to say he was a civilian at the time of his disappearance.
Levinson's family last heard from him in 2010 in the form of a 'proof of life' video and now, they're demanding to know why more hasn't been done to bring him home.
CNN's Jim Sciutto has more.