Armed individuals dressed in tactical gear are surveilling ballot drop boxes in Arizona , raising concerns about intimidation during early voting in the midterm elections.

The Maricopa County Elections Department said two people with weapons were spotted at a ballot drop box in Mesa on Friday. The two wore masks to obscure their faces and left the area after the county sheriffs office responded.

And on Saturday night, four people two of them reportedly armed with handguns got into a confrontation at the same drop box when another individual arrived and attempted to record their license plate information.