WASHINGTON, July 30 (Reuters) - The chair of the Federal

Communications Commission is opening a probe into NBC-parent

Comcast's ( CMCSA ) relationships with its local broadcast TV

affiliates, the latest in a series of investigations into major

U.S. broadcasters.

FCC Chair Brendan Carr said in a letter to Comcast ( CMCSA ) CEO Brian

Roberts, seen by Reuters, that he was investigating after

reports that NBC and other similarly situated networks are

seeking "to extract onerous financial and operational

concessions from local broadcast TV stations." Comcast ( CMCSA ) did not

immediately respond to a request for comment.