Forbes – The U.S. Embassy in Mexico issued an “Emergency Message” warning  U.S. citizens in Oaxaca to keep away from mass demonstrations and exercise caution in anticipation of Sunday’s volatile mid-term elections.

http://www.forbes.com/sites/doliaestevez/2015/06/04/u-s-issues-emergency-message-for-americans-as-protests-escalate-in-mexicos-oaxaca-state/