Activists in Ferguson, Missouri are on edge following the deaths of six men linked to protests more than four years ago.

Two men were found in burned cars, three died of apparent suicides, and one was ruled a drug overdose after collapsing on a bus.

All linked to protests following the police shooting death of 18-year-old Michael Brown. However, police say only two are homicides and that they’re having trouble finding witnesses to come forward.

Police say there’s no evidence that the deaths are related. Though, others in the community aren’t so sure. They say protest leaders have received anonymous threats ever since the protests.

Source: https://abcnews.go.com/US/wireStory/puzzling-number-men-tied-ferguson-protests-died-61744427