(CNN) -- Three days after Asiana Airlines Flight 214 crash landed at San Francisco International Airport with the loss of two lives, there is still no official explanation for what caused the incident. Officials have said the Boeing 777, which had flown from Seoul in South Korea, was traveling slower than recommended on its final approach, though it could be months before a definite cause for this is determined. Before that an expert team of air crash investigators must complete a thorough analysis of the events leading up to the crash. CNN looks at how such an investigation works. Interactive: What happened with Asiana Flight 214?
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Official: Asiana Flight 214 was traveling slower than was recommended
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Air crash investigators must complete analysis of events leading up to crash
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National Transportation Safety Board investigating Asiana incident
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Investigators will look at all factors, from mechanical to human
Here, the @placeholder relies largely on other parties, including the airline involved, the aircraft's manufacturer, and in the case of international flights, investigators from the airline's home country, to help examine evidence.