Police stand guard in the pedestrian street where a small explosive was tossed at the National Action Party headquarters, in Chilpancingo, Mexico, in the early morning hours of Friday, June 5, 2015. Radical groups and unionized teachers have vowed to block Sunday's voting for the lower house of congress, nine governorships and hundreds of mayorships.
Police stand guard in the pedestrian street where a small explosive was tossed at the National Action Party headquarters, in Chilpancingo, Mexico, in the early morning hours of Friday, June 5, 2015. Radical groups and unionized teachers have vowed to block Sunday's voting for the lower house of congress, nine governorships and hundreds of mayorships. AP
Police stand guard in the pedestrian street where a small explosive was tossed at the National Action Party headquarters, in Chilpancingo, Mexico, in the early morning hours of Friday, June 5, 2015. Radical groups and unionized teachers have vowed to block Sunday's voting for the lower house of congress, nine governorships and hundreds of mayorships. AP

Violence in 2 states as Mexicans vote in tense mid-term elections

June 07, 2015 2:14 PM

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