Still trying to figure this out...reports indicate that the plane crashed through a fence. Yet, an "ear" and "eyewitness" on the phone, claimed he heard one explosion, then ran outside and saw the plane consumed by a massive fireball down the runway. The fireball was followed by yet another explosion.
How could the plane have crashed through a fence, yet go down the runway in flames?
Probably lost an engine as the aircraft was just getting airborne. It may have then come down hard, rupturing a fuel tank and then lost another fuel tank as it hit the fence.
There are plenty of possibilities. It is amazing anyone survived if the aircraft burned before the passengers could get out.
Remember that the "eyewitness" likely didn't see the initial incident. He probably looked over when he heard the noise, so he probably only saw the subsequent fire and explosions.