Passengers on board the Alaska Airlines Boeing 737 Max 9 that suffered a terrifying midair blowout in January have received a letter from the FBI saying they may be victims “of a crime.”

Attorney Mark Lindquist, who represents multiple passengers that were on Alaska Airlines flight 1282, shared with CNN the letter that the FBI office in Seattle sent to passengers on Tuesday.

Boeing’s potential criminal liability

But Justice opened a probe into the incident and Boeing in February, CNN has previously reported. That investigation carries the potential to upend a controversial deferred prosecution agreement that Boeing reached with the Justice Department in the final month of the Trump administration.

Tha settlement, which was criticized by families of crash victims and members of Congress, was over charges that Boeing defrauded the Federal Aviation Administration during the original certification process for the 737 Max jets. Boeing agreed to pay $2.5 billion as part of that settlement, but most of that was money Boeing had already agreed to pay to the airlines that had purchased the Max jets grounded for 20 monthsfollowing the Ethiopian Air crash and an earlier crash in Indonesia.

The deferred prosecution agreement could have ended the threat of Boeing facing criminal liability for those earlier fraud charges. But the Alaska Air incident came just days before a three-year probation-like period was due to end, so the criminal probe could expose Boeing to charges not just for the Alaska Air incident but also the earlier allegations of criminal wrongdoing.