Probe widens into mysterious plane crash in southern China

Officials say they are not ruling out any possible scenario in their investigation into the Boeing 737 crash that killed 132 people.

As investigators try to piece together clues on what caused a Chinese passenger plane to plunge from the sky Monday, officials told ABC News they are looking at every possible avenue, including an intentional downing.

None of the 123 passengers and nine crew members aboard Eastern Airlines Flight 5735 survived when it crashed into the mountains in the Guangxi region of southern China.

Early data shows the Boeing 737-800 plunged from 29,000 feet to 8,000 feet, leveled off and then went into a freefall, exploding into a fireball that was seen and filmed by people nearby.

On the ground, crews have found few clues as to what caused the disaster. The plane's black boxes haven't been recovered.