Things are getting increasingly testy in the first-round playoff series between the Washington Capitals and the Montreal Canadiens.

The NHL has fined the Montreal Canadiens and Washington Capitals $25,000 US each for unsportsmanlike conduct during warmup before Game 4, marking another round of discipline in the testy first-round Stanley Cup playoff series.

Montreal defenseman Arber Xhekaj and Washington blueliner Dylan McIlrath were both fined the maximum amount by the NHL on Monday for unsportsmanlike conduct that took place during pregame warmups prior to Game 4.