The US National Transportation Safety Board (NTSB) has dispatched a team to aid in the investigation of an Asiana cargo aircraft on 28 July.
The Boeing 747-400 crashed near Jeju Island enroute from Seoul to Shanghai Pudong International airport.
It has been discovered the aircraft had a fire in its hold, but South Korean officials, while saying the fire likely contributed to the crash, stressed the exact cause of the accident has yet to be determined.
So far the investigation has revealed the aircraft was carrying 400kg of lithium batteries, paint and other potentially dangerous materials.
NTSB has designated safety investigator John Lovell as the US accredited representative in the investigation, and he will be assisted by NTSB staff and advisors from FAA and Boeing.