WASHINGTON, June 27 (Reuters) - The National

Transportation Safety Board said early Thursday it is

sanctioning Boeing ( BA ) for disclosing non-public details of the

ongoing investigation into the Jan. 5 Alaska Airlines

737 MAX 9 mid-air emergency.

The NTSB said Boeing ( BA ) had "blatantly violated" the agency's

investigative regulations "by providing non-public investigative

information to the media and speculating about possible causes

of the Jan. 5 door-plug blowout."

The NTSB said Boeing ( BA ) would no longer have access to the

investigative information the NTSB produces during its

investigation and added the planemaker will not be allowed to

ask questions of other participants at an investigative hearing

on the door-plug blowout in early August.