Dover police said they arrested 31-year-old Jerome Aniska of Wilmington, Delaware.
Police say it happened Friday morning after Aniska engaged with demonstrators that were on a public sidewalk in Dover. Police say during an argument, Aniska pulled out a black handgun and made a threatening statement to the group.
Aniska has been charged with aggravated menacing, terroristic threatening and possession of a firearm during commission of a felony. He was released on $26,000 bond.