Investigators are trying to work out why a plane - carrying more than 150 people - was forced to crash-land at London's Heathrow.
All 136 passengers and 16 crew survived the dramatic landing, which badly damaged the British Airways plane.
The Air Accidents Investigation Branch will interview the pilot and crew and write an initial report in 48 hours.
Prime Minister Gordon Brown was at the airport at the time and praised the calmness of the plane staff.
It's important to remember that plane accidents like this are very rare.
The Boeing 777 was on its way back from China when it crash-landed before it reached the runway, near a busy road, possibly after both its engines failed.
The crash has caused travel delays for passengers as more than 200 flights had to be cancelled or diverted to other airports.
Part of the undercarriage, including two wheels were torn off, and there was some damage to the wings.
Eighteen people needed treatment for slight injuries, including whiplash but only one person was kept in hospital overnight.
Quite terrifying
Passenger Antonio De Crescenzo, 52, from Naples in Italy, said: "We were coming in to land but the plane felt like it should have been taking off. The engines were roaring and then we landed and it was just banging.
"It felt very sudden. Some people started to scream. It was quite terrifying although people seemed to be quite calm."