The U.S. National Transportation Safety Board (NTSB) has warned against prematurely speculating about what caused Saturday's crash landing of Asiana Airlines Flight 214. 

NTSB Chairwoman Deborah Hersman made the comment to reporters during a news briefing on Tuesday, noting the pilot in the captain's seat on the flight was relatively new to the Boeing 777.  

She said the pilot had nine-thousand-700 hours of flight experience and about 35 hours of flight time on the Boeing model, putting him roughly halfway through the required training of 20 legs and 60 flight hours.  

Hersman noted that the supervisory training captain for the pilot was serving as flight instructor for the first time.
 
The NTSB also announced that after investigating the body of the plane, it was discovered the aircraft’s landing gear struck the seawall in front of the runway first. The plane's tail section then clipped the seawall and was severed. 

The safety board has also launched a probe on the evacuation process and is analyzing the plane’s eight emergency slides.