WASHINGTON, Aug 27 (Reuters) - The U.S. workplace safety

agency said it is opening an investigation after two workers

were killed and one seriously injured at a Delta Air Lines ( DAL )

aircraft maintenance facility at the Atlanta airport on

Tuesday.

Delta said the incident happened shortly after 5 a.m. EDT at

a facility in Delta's technical operations center adjacent to

the Hartsfield-Jackson Atlanta International Airport.

The injured worker remains under medical care following the

accident, which involved wheel components that were being

disassembled for maintenance and were not attached to an

airplane, Delta said.

The U.S. Occupational Safety and Health Administration told

Reuters it was opening an investigation. The Federal Aviation

Administration said it was in contact with Delta about the

incident.

"This news is heartbreaking for all of us," Delta said. "We

are now working with local authorities and conducting a full

investigation to determine what happened."

Delta said the cause of the accident has not been released.

(Reporting by Brendan O'Brien in Chicago and David Shepardson

in Washington; Editing by Caitlin Webber, David Holmes, Rod

Nickel and Lincoln Feast.)