USA Update Asiana crash: five clues to help understand what happened

Investigators are interviewing the flight's pilots and crew to help determine the cause of the Asiana crash at San Francisco International Airport on Saturday. Here are several factors under scrutiny.

By , Correspondent

Marcio Jose Sanchez/AP

Investigators expect to spend weeks or months determining what caused Asiana Airlines Flight 214 to crash-land at the San Francisco airport Saturday, killing two of the 307 passengers and crew members aboard.