A racially-motivated shooting in the United States over the weekend is being investigated as a hate crime. 

The 21-year-old gunman legally bought the firearms used to kill three black people at a dollar store in Jacksonville, Florida. 

US Correspondent Richard Arnold told Mike Hosking that it was on the 60th anniversary of the civil rights march on Washington. 

He says a recent FBI report shows hate crimes spiked by 35% in the past year. 

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