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From October 22 - November 1, 2018, sixteen packages found to contain pipe bombs were mailed via the U. S. Postal Service to several Democratic Party politicians and other prominent critics of U. S. President Donald Trump. Targets included former U. S. President Barack Obama, former U. S. Vice President Joe Biden, and former U. S. Senator and Secretary of State Hillary Clinton, who ran as the Democratic presidential candidate opposing Trump in the 2016 election. The packages were identified as suspicious and investigated. These mailings took place when two episodes of fatal shootings, in Pittsburgh, Pennsylvania and Louisville, Kentucky, were conducted against ethnic minorities, with a total of thirteen persons killed.

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