The National Transportation Safety Board (NTSB) said Monday that they had recovered the wreckage of one plane involved in the deadly crash during the Wings Over Dallas air show.

The plane crash killed six people on Saturday in front of spectators in a horrifying accident, as reported by The Dallas Express.

An NTSB spokesperson said that they transported the wreckage of one of the planes, a P-63 Cobra, to a secure location. The other plane involved in the crash, a B-17 Bomber, has yet to be fully recovered due to rainy weather on Monday which forced authorities to temporarily suspend their efforts.

However, certain electronic devices from both aircraft were also retrieved. A GPS navigational unit was recovered from the P-63 Cobra and a flight display from the B-17 Bomber, although both were damaged during the crash.

During a press conference on Monday, the NTSB explained that it was reviewing and analyzing the radio sequence from the air show’s common radio frequency as well as video from spectators.

“Being an air show, we received quite a bit of this and we have staff on it right now,” Michael Graham, spokesperson for the NTSB, said. “They’ll be at it for quite some time with the numbers we received.”

Dallas aviation attorney Kent Krause told NBC 5 that he believes the crash was likely caused by pilot error, granted no unknown mechanical malfunction is discovered.

“It looks to me like the pilot in the Cobra was trying to connect up with the other fighters that were ahead of him and went into a bank to turn and was going much more rapidly than the B-17,” Krause said. “The long and short of it is I don’t think he had any idea that he was about to run into another plane.”

However, Krause said it was too early to come to any definitive conclusions.

Meanwhile, the NTSB is in the process of preparing its preliminary report, which it said could take at least a month.