Authorities have classified the shooting at an historically black South Carolina church as a hate crime.

The suspect, Dylann Roof, is alleged to have killed nine people attending a bible study class at the church.

According to the latest FBI data available, over 7,000 people were victims of hate crimes throughout the US in 2013.

So, what does the data tell us about who's committing these crimes and why? The BBC's David Botti takes a look.