Moment gunman, 21, storms into Florida Dollar General and slaughters three black people in racist attack using assault rifle with swastikas - as cops say his writings were the 'diary of a madman'

Terrifying video (bottom) shows the moment Ryan Palmeter entered the Jacksonville Dollar General armed with an AR-15 and then shot dead three people in a racially-motivated attack. Palmeter (top), 21, left behind a manifesto, which cops called the 'diary of a madman.' He used an assault rifle covered in Nazi swastikas in the deadly assault on Saturday before turning the gun on himself, according to the Jacksonville Sheriff's Office. The victims were a 52-year-old woman, Angela Michelle Carr and a 19-year-old Anolt Joseph "A.J." Laguerre Jr., and 29-year-old Jarrald De'Shawn Gallion. Sheriff T.K. Waters said the gunman 'hated black people' and 'wanted to kill 'n******'.' He described the shooting as a 'dark day in Jacksonville's history'. Both the rifle and handgun were legal and had been purchased legally, Waters said. The firearms dealers ― Wild West Guns and Orange Park Gun and Pawn — followed proper procedures in the sales, he added.