(Reuters) - A union representing striking machinists at Boeing said Friday it is actively engaged in indirect discussions with the planemaker that are being facilitated by Acting U.S. Labor Secretary Julie Su.

"We are fully committed to these talks. It is our responsibility to attempt to reach a resolution," said the International Association of Machinists and Aerospace Workers Local 751 in a social media post. Around 33,000 of Boeing's unionized West Coast workers, most in Washington state, have been on strike since Sept. 13, demanding a 40% wage increase spread over four years and halting production of the planemaker's best-selling 737 MAX and its 767 and 777 widebodies.