Here is a tweet from Andrew Das of The New York Times, noting that negotiations between the referees and PRO, the organization that overseas officiating in the U.S. and Canada, have been canceled and regular assignments for Week 2 have been pulled.
Opening weekend wasn’t an issue, but there are more games this time.
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MLS referees union says PRO canceled talks for today, pulled officials' assignments for week 2. So lockout continues.
— Andrew Das (@AndrewDasNYT) March 11, 2014