WASHINGTON (AP) — Federal mediators are entering the stalled NHL labor talks, with the season’s first two months already lost because of the lockout.

George Cohen, director of the Federal Mediation and Conciliation Service, said the parties had agreed to use the agency. He assigned three mediators to assist negotiations — deputy director Scot Beckenbaugh, director of mediation services John Sweeney and Commissioner Guy Serota — who was removed later in the day because of a Twitter account that may have been tampered with.

The sides are to meet separately with the mediators today.

Cohen has worked with the players’ associations for Major League Baseball, helping end the 1994-95 strike as an outside counsel, and the NBA. He was an adviser to the NHL players’ union before joining FMCS three years ago.

Cohen mediated during the 2010 negotiations in Major League Soccer and 2011 talks in the NFL and NBA, along with this year’s dispute between the NFL and its on-field officials.

Hockey players and management have not negotiated since Nov. 21. The NHL has canceled more than one-third of its regular season, including all games through Dec. 14, the New Year’s Day outdoor Winter Classic and the All-Star weekend scheduled for Jan. 26-27 at Columbus, Ohio.

“I have had separate, informal discussions with the key representatives of the National Hockey League and the National Hockey League Players’ Association during the course of their negotiations for a successor collective bargaining agreement,” Cohen said in a statement.

“Due to the extreme sensitivity of these negotiations and consistent with the FMCS’s longstanding practice, the agency will refrain from any public comment concerning the future schedule and/or the status of the negotiations until further notice.”

Beckenbaugh was a mediator during the 2004-05 lockout, a stoppage that caused cancellation of the entire season.