Beijing revoked the work permits of Chinese citizens working as researchers and assistants at U.S. media organizations in China, the latest in a tit-for-tat diplomatic dispute.

Two Chinese news assistants at the New York Times and one at the Wall Street Journal were told by the Beijing Service Bureau for Diplomatic Missions earlier this week that their work permits were revoked, the South China Morning Post reported. A Chinese news assistant at Voice of America also had their work permit rescinded.