Two ballot drop boxes in the Pacific Northwest were damaged in a suspected arson attack just over a week before US election day, destroying hundreds of ballots at one location in Vancouver, Washington.At the other, in neighbouring Portland, Oregon, it appears a fire suppression system worked to contain the blaze and limited the number of ballots damaged to three. Authorities are reviewing surveillance footage as they try to identify who is responsible.Here’s what happened, how rules and security measures about drop boxes vary across the country, and how election conspiracy theories have undermined confidence in their use.
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