The death toll from a crash at an air race at Reno, Nevada, has risen to 10, one of the hospitals treating patients from Friday's accident said Monday.
Close to 70 people were injured in the incident, which occurred Friday.
National Transportation Safety Board member Mark Rosekind said investigators are looking at whether the plane's apparently damaged elevator trim tab - whose breaking apart was captured in a photograph - played a role in the nosedive crash. Authorities do not know why the aircraft went down.
A full investigation could take six to nine months, Rosekind said.
Investigators will be poring over a trove of spectators' videos and photos, he said.
"It seems there were a tremendous number of cameras and video that was captured," he said. "On the one hand, it's an excellent source of information, but on the other hand, there's not a lot of other specific components from the wreckage that at this point we can identify."
At the time of the crash, three NTSB investigators happened to be at the air show - a common practice - and one of them has been appointed investigator in charge, Rosekind said.
The board will look at safety oversight and the placement of the grandstands for the air race, Rosekind said.