Federal aviation officials say the plane that crashed at San Francisco International Airport on Saturday was flying too slow to make a landing. Two people were killed and scores were injured when an Asiana Airlines jet from Seoul hit a seal wall and then skidded for hundreds of feet before catching fire. Eight of the wounded are in critical condition. The chair of the National Transportation Safety Board, Deborah Hersman, said the pilot made a failed attempt to abort the landing after coming in at too slow a speed.

Deborah Hersman: “We need to take a closer look on the raw data on the flight data recorder, as well as corroborate that with radar and air traffic information, to make sure that we have a very precise speed. But again, we’re not talking about a few knots here or there; we’re talking about a significant amount of speed below 137.”

Asiana Airlines says it has ruled out mechanical failure and is focusing on the pilot, who reportedly had little experience flying the Boeing 777 involved. Meanwhile, on Sunday 10 people were killed when a floatplane crashed at an airport in Alaska. No survivors were found.