A new batch of messages between Boeing Co. employees on the development of the 737 Max paints a “very disturbing picture” of concerns about the plane, according to an aide to a House committee.

The documents were turned over to the Federal Aviation Administration on Monday, the agency said in a statement. The disclosure came the same day that Boeing ousted its chief executive officer.

At least some of them were written by the same Boeing pilot whose 2016 messages were released in October and were the subject of sharp questioning by lawmakers, according to a person familiar with their contents who wasn’t authorized to discuss them.

The communications haven’t been released publicly. The staff of the Transportation and Infrastructure Committee are still reviewing the messages and didn’t provide specific details about what they contain.

“But similar to other records previously disclosed by Boeing, the records appear to point to a very disturbing picture of both concerns expressed by Boeing employees about the company’s commitment to safety and efforts by some employees to ensure Boeing’s production plans were not diverted by regulators or others,” a committee aide said in a statement.

Read more: yahoo